<s>
Mozilla	B-Application
Firefox	I-Application
,	O
or	O
simply	O
Firefox	B-Application
,	O
is	O
a	O
free	B-License
and	I-License
open-source	I-License
web	B-Application
browser	I-Application
developed	O
by	O
the	B-Operating_System
Mozilla	I-Operating_System
Foundation	I-Operating_System
and	O
its	O
subsidiary	O
,	O
the	O
Mozilla	B-Operating_System
Corporation	O
.	O
</s>
<s>
It	O
uses	O
the	O
Gecko	B-Language
rendering	I-Language
engine	I-Language
to	O
display	O
web	O
pages	O
,	O
which	O
implements	O
current	O
and	O
anticipated	O
web	O
standards	O
.	O
</s>
<s>
In	O
November	O
2017	O
,	O
Firefox	B-Application
began	O
incorporating	O
new	O
technology	O
under	O
the	O
code	O
name	O
"	O
Quantum	B-Application
"	O
to	O
promote	O
parallelism	B-Operating_System
and	O
a	O
more	O
intuitive	O
user	B-Application
interface	I-Application
.	O
</s>
<s>
Firefox	B-Application
is	O
available	O
for	O
Windows	B-Device
7	I-Device
and	O
later	O
versions	O
,	O
macOS	B-Operating_System
,	O
and	O
Linux	B-Application
.	O
</s>
<s>
Its	O
unofficial	O
ports	O
are	O
available	O
for	O
various	O
Unix	B-Application
and	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
,	O
including	O
FreeBSD	B-Operating_System
,	O
OpenBSD	B-Operating_System
,	O
NetBSD	B-Device
,	O
illumos	B-Application
,	O
and	O
Solaris	B-Application
Unix	I-Application
.	O
</s>
<s>
It	O
is	O
also	O
available	O
for	O
Android	B-Application
and	O
iOS	B-Application
.	O
</s>
<s>
However	O
,	O
as	O
with	O
all	O
other	O
iOS	B-Application
web	B-Application
browsers	I-Application
,	O
the	O
iOS	B-Application
version	O
uses	O
the	O
WebKit	B-Language
layout	B-Protocol
engine	I-Protocol
instead	O
of	O
Gecko	B-Language
due	O
to	O
platform	O
requirements	O
.	O
</s>
<s>
An	O
optimized	O
version	O
is	O
also	O
available	O
on	O
the	O
Amazon	B-Application
Fire	I-Application
TV	I-Application
as	O
one	O
of	O
the	O
two	O
main	O
browsers	B-Application
available	O
with	O
Amazon	B-Protocol
's	I-Protocol
Silk	I-Protocol
Browser	I-Protocol
.	O
</s>
<s>
Firefox	B-Application
was	O
created	O
in	O
2002	O
under	O
the	O
code	O
name	O
"	O
Phoenix	B-Application
"	O
by	O
members	O
of	O
the	O
Mozilla	B-Operating_System
community	O
who	O
desired	O
a	O
standalone	O
browser	B-Application
rather	O
than	O
the	O
Mozilla	B-Language
Application	I-Language
Suite	I-Language
bundle	O
.	O
</s>
<s>
During	O
its	O
beta	O
phase	O
,	O
it	O
proved	O
to	O
be	O
popular	O
with	O
its	O
testers	O
and	O
was	O
praised	O
for	O
its	O
speed	O
,	O
security	O
,	O
and	O
add-ons	B-Operating_System
compared	O
to	O
Microsoft	O
's	O
then-dominant	O
Internet	B-Application
Explorer	I-Application
6	O
.	O
</s>
<s>
It	O
was	O
released	O
on	O
November	O
9	O
,	O
2004	O
,	O
and	O
challenged	O
Internet	B-Application
Explorer	I-Application
's	O
dominance	O
with	O
60million	O
downloads	O
within	O
nine	O
months	O
.	O
</s>
<s>
It	O
is	O
the	O
spiritual	O
successor	O
of	O
Netscape	B-Protocol
Navigator	I-Protocol
,	O
as	O
the	O
Mozilla	B-Operating_System
community	O
was	O
created	O
by	O
Netscape	B-Protocol
in	O
1998	O
,	O
before	O
its	O
acquisition	O
by	O
AOL	O
.	O
</s>
<s>
Firefox	B-Application
usage	O
share	O
grew	O
to	O
a	O
peak	O
of	O
32.21	O
%	O
in	O
November	O
2009	O
,	O
with	O
Firefox	B-Language
3.5	I-Language
overtaking	O
Internet	B-Application
Explorer	I-Application
7	I-Application
,	O
although	O
not	O
all	O
versions	O
of	O
Internet	B-Application
Explorer	I-Application
as	O
a	O
whole	O
;	O
its	O
usage	O
then	O
declined	O
in	O
competition	O
with	O
Google	B-Application
Chrome	I-Application
.	O
</s>
<s>
,	O
according	O
to	O
StatCounter	O
,	O
it	O
had	O
a	O
7.1	O
%	O
usage	O
share	O
as	O
a	O
desktop	B-Application
web	B-Application
browser	I-Application
,	O
making	O
it	O
the	O
fourth-most	O
popular	O
desktop	B-Application
web	B-Application
browser	I-Application
after	O
Google	B-Application
Chrome	I-Application
(	O
66.1	O
%	O
)	O
,	O
Microsoft	B-Application
Edge	I-Application
(	O
11.2	O
%	O
)	O
,	O
and	O
Safari	B-Application
(	O
9.6	O
%	O
)	O
.	O
</s>
<s>
Across	B-Application
all	I-Application
platforms	I-Application
,	O
it	O
again	O
places	O
fourth	O
with	O
a	O
usage	O
share	O
of	O
3.04	O
%	O
.	O
</s>
<s>
The	O
project	O
began	O
as	O
an	O
experimental	O
branch	O
of	O
the	O
Mozilla	B-Operating_System
project	I-Operating_System
by	O
Dave	O
Hyatt	O
,	O
Joe	O
Hewitt	O
,	O
and	O
Blake	O
Ross	O
.	O
</s>
<s>
They	O
believed	O
the	O
commercial	O
requirements	O
of	O
Netscape	B-Protocol
's	O
sponsorship	O
and	O
developer-driven	O
feature	O
creep	O
compromised	O
the	O
utility	O
of	O
the	O
Mozilla	B-Operating_System
browser	B-Application
.	O
</s>
<s>
To	O
combat	O
what	O
they	O
saw	O
as	O
the	O
Mozilla	B-Language
Suite	I-Language
's	O
software	O
bloat	O
,	O
they	O
created	O
a	O
standalone	O
browser	B-Application
,	O
with	O
which	O
they	O
intended	O
to	O
replace	O
the	O
Mozilla	B-Language
Suite	I-Language
.	O
</s>
<s>
On	O
April	O
3	O
,	O
2003	O
,	O
the	O
Mozilla	B-Operating_System
Organization	I-Operating_System
announced	O
that	O
it	O
planned	O
to	O
change	O
its	O
focus	O
from	O
the	O
Mozilla	B-Language
Suite	I-Language
to	O
Firefox	B-Application
and	O
Thunderbird	B-Application
.	O
</s>
<s>
The	O
Firefox	B-Application
project	O
has	O
undergone	O
several	O
name	O
changes	O
.	O
</s>
<s>
The	O
nascent	O
browser	B-Application
was	O
originally	O
named	O
Phoenix	B-Application
,	O
after	O
the	O
mythical	O
bird	O
that	O
rose	O
triumphantly	O
from	O
the	O
ashes	O
of	O
its	O
dead	O
predecessor	O
(	O
in	O
this	O
case	O
,	O
from	O
the	O
"	O
ashes	O
"	O
of	O
Netscape	B-Protocol
Navigator	I-Protocol
,	O
after	O
it	O
was	O
sidelined	O
by	O
Microsoft	B-Application
Internet	I-Application
Explorer	I-Application
in	O
the	O
"	O
First	O
Browser	B-Application
War	O
"	O
)	O
.	O
</s>
<s>
Phoenix	B-Application
was	O
renamed	O
in	O
2003	O
due	O
to	O
a	O
trademark	O
claim	O
from	O
Phoenix	B-Application
Technologies	O
.	O
</s>
<s>
The	O
replacement	O
name	O
,	O
Firebird	B-Application
,	O
provoked	O
an	O
intense	O
response	O
from	O
the	O
Firebird	B-Application
database	O
software	O
project	O
.	O
</s>
<s>
The	B-Operating_System
Mozilla	I-Operating_System
Foundation	I-Operating_System
reassured	O
them	O
that	O
the	O
browser	B-Application
would	O
always	O
bear	O
the	O
name	O
Mozilla	B-Application
Firebird	I-Application
to	O
avoid	O
confusion	O
.	O
</s>
<s>
After	O
further	O
pressure	O
,	O
Mozilla	B-Application
Firebird	I-Application
became	O
Mozilla	B-Application
Firefox	I-Application
on	O
February	O
9	O
,	O
2004	O
.	O
</s>
<s>
The	O
name	O
Firefox	B-Application
was	O
said	O
to	O
be	O
derived	O
from	O
a	O
nickname	O
of	O
the	O
red	O
panda	O
,	O
which	O
became	O
the	O
mascot	O
for	O
the	O
newly	O
named	O
project	O
.	O
</s>
<s>
For	O
the	O
abbreviation	O
of	O
Firefox	B-Application
,	O
Mozilla	B-Operating_System
prefers	O
Fx	O
or	O
fx	O
,	O
although	O
it	O
is	O
often	O
abbreviated	O
as	O
FF	O
.	O
</s>
<s>
The	O
Firefox	B-Application
project	O
went	O
through	O
many	O
versions	O
before	O
version	O
1.0	O
and	O
had	O
already	O
gained	O
a	O
great	O
deal	O
of	O
acclaim	O
from	O
numerous	O
media	O
outlets	O
,	O
such	O
as	O
Forbes	O
and	O
The	O
Wall	O
Street	O
Journal	O
.	O
</s>
<s>
Among	O
Firefox	B-Application
's	O
popular	O
features	O
were	O
the	O
integrated	O
pop-up	O
blocker	O
,	O
tabbed	O
browsing	O
,	O
and	O
an	O
extension	B-Protocol
mechanism	O
for	O
adding	O
functionality	O
.	O
</s>
<s>
Although	O
these	O
features	O
have	O
already	O
been	O
available	O
for	O
some	O
time	O
in	O
other	O
browsers	B-Application
such	O
as	O
the	O
Mozilla	B-Language
Suite	I-Language
and	O
Opera	B-Application
,	O
Firefox	B-Application
was	O
the	O
first	O
of	O
these	O
browsers	B-Application
to	O
have	O
achieved	O
large-scale	O
adoption	O
.	O
</s>
<s>
Firefox	B-Application
attracted	O
attention	O
as	O
an	O
alternative	O
to	O
Internet	B-Application
Explorer	I-Application
,	O
which	O
had	O
come	O
under	O
fire	O
for	O
its	O
alleged	O
poor	O
program	O
design	O
and	O
insecurity	O
—	O
detractors	O
cite	O
IE	O
's	O
lack	O
of	O
support	O
for	O
certain	O
Web	O
standards	O
,	O
use	O
of	O
the	O
potentially	O
dangerous	O
ActiveX	B-Application
component	I-Application
,	O
and	O
vulnerability	O
to	O
spyware	O
and	O
malware	O
installation	O
.	O
</s>
<s>
Microsoft	O
responded	O
by	O
releasing	O
Windows	B-Application
XP	I-Application
Service	O
Pack	O
2	O
,	O
which	O
added	O
several	O
important	O
security	O
features	O
to	O
Internet	B-Application
Explorer	I-Application
6	O
.	O
</s>
<s>
Version	O
1.0	O
of	O
Firefox	B-Application
was	O
released	O
on	O
November	O
9	O
,	O
2004	O
.	O
</s>
<s>
Major	O
redesigns	O
of	O
its	O
graphical	B-Application
user	I-Application
interface	I-Application
occurred	O
on	O
versions	O
4.0	O
in	O
March	O
2011	O
,	O
29.0	O
"	O
Australis	O
"	O
in	O
April	O
2014	O
,	O
57.0	O
"	O
Quantum	B-Application
"	O
in	O
November	O
2017	O
,	O
and	O
89.0	O
"	O
Proton	O
"	O
in	O
June	O
2021	O
.	O
</s>
<s>
In	O
2016	O
,	O
Mozilla	B-Operating_System
announced	O
a	O
project	O
known	O
as	O
Quantum	B-Application
,	O
which	O
sought	O
to	O
improve	O
Firefox	B-Application
's	O
Gecko	B-Language
engine	I-Language
and	O
other	O
components	O
to	O
improve	O
the	O
browser	B-Application
's	O
performance	O
,	O
modernize	O
its	O
architecture	O
,	O
and	O
transition	O
the	O
browser	B-Application
to	O
a	O
multi-process	O
model	O
.	O
</s>
<s>
These	O
improvements	O
came	O
in	O
the	O
wake	O
of	O
decreasing	O
market	O
share	O
to	O
Google	B-Application
Chrome	I-Application
,	O
as	O
well	O
as	O
concerns	O
that	O
its	O
performance	O
was	O
lapsing	O
in	O
comparison	O
.	O
</s>
<s>
Despite	O
its	O
improvements	O
,	O
these	O
changes	O
required	O
existing	O
add-ons	B-Operating_System
for	O
Firefox	B-Application
to	O
be	O
made	O
incompatible	O
with	O
newer	O
versions	O
,	O
in	O
favor	O
of	O
a	O
new	O
extension	B-Protocol
system	O
that	O
is	O
designed	O
to	O
be	O
similar	O
to	O
Chrome	B-Application
and	O
other	O
recent	O
browsers	B-Application
.	O
</s>
<s>
Firefox	B-Application
57	O
,	O
which	O
was	O
released	O
in	O
November	O
2017	O
,	O
was	O
the	O
first	O
version	O
to	O
contain	O
enhancements	O
from	O
Quantum	B-Application
,	O
and	O
has	O
thus	O
been	O
named	O
Firefox	B-Application
Quantum	B-Application
.	O
</s>
<s>
A	O
Mozilla	B-Operating_System
executive	O
stated	O
that	O
Quantum	B-Application
was	O
the	O
"	O
biggest	O
update	O
"	O
to	O
the	O
browser	B-Application
since	O
version	O
1.0	O
.	O
</s>
<s>
While	O
Chrome	B-Application
uses	O
separate	O
processes	O
for	O
each	O
loaded	O
tab	O
,	O
Firefox	B-Application
distributes	O
tabs	O
over	O
four	O
processes	O
by	O
default	O
(	O
since	O
Quantum	B-Application
)	O
,	O
in	O
order	O
to	O
balance	O
memory	O
consumption	O
and	O
performance	O
.	O
</s>
<s>
The	O
process	O
count	O
can	O
be	O
adjusted	O
,	O
where	O
more	O
processes	O
increase	O
performance	O
at	O
the	O
cost	O
of	O
memory	O
,	O
therefore	O
suitable	O
for	O
computers	O
with	O
larger	O
RAM	B-Architecture
capacity	O
.	O
</s>
<s>
On	O
May	O
3	O
,	O
2019	O
,	O
the	O
expiration	O
of	O
an	O
intermediate	O
signing	O
certificate	O
on	O
Mozilla	B-Operating_System
servers	O
caused	O
Firefox	B-Application
to	O
automatically	O
disable	O
and	O
lock	O
all	O
browser	B-Protocol
extensions	I-Protocol
(	O
add-ons	B-Operating_System
)	O
.	O
</s>
<s>
Mozilla	B-Operating_System
began	O
the	O
roll-out	O
of	O
a	O
fix	O
shortly	O
thereafter	O
,	O
using	O
their	O
Mozilla	B-Operating_System
Studies	O
component	O
.	O
</s>
<s>
On	O
January	O
13	O
,	O
2022	O
,	O
an	O
issue	O
with	O
Firefox	B-Application
's	O
HTTP/3	O
implementation	O
resulted	O
in	O
a	O
widespread	O
outage	O
for	O
multiple	O
hours	O
.	O
</s>
<s>
Features	O
of	O
the	O
desktop	B-Application
edition	O
include	O
tabbed	O
browsing	O
,	O
full-screen	O
mode	O
,	O
spell	B-Application
checking	I-Application
,	O
incremental	B-Application
search	I-Application
,	O
smart	B-Protocol
bookmarks	I-Protocol
,	O
bookmarking	O
and	O
downloading	O
through	O
drag	O
and	O
drop	O
,	O
a	O
download	B-Protocol
manager	I-Protocol
,	O
user	O
profile	O
management	O
,	O
private	B-Protocol
browsing	I-Protocol
,	O
bookmark	O
tags	O
,	O
bookmark	O
exporting	B-General_Concept
,	O
offline	O
mode	O
,	O
a	O
screenshot	B-Application
tool	O
,	O
web	B-Application
development	I-Application
tools	I-Application
,	O
a	O
"	O
page	O
info	O
"	O
feature	O
which	O
shows	O
a	O
list	O
of	O
page	O
metadata	O
and	O
multimedia	O
items	O
,	O
a	O
sophisticated	O
configuration	O
menu	O
at	O
about:config	O
for	O
power	B-General_Concept
users	I-General_Concept
,	O
and	O
more	O
location-aware	O
browsing	O
(	O
also	O
known	O
as	O
"	O
geolocation	O
"	O
)	O
based	O
on	O
a	O
Google	O
service	O
.	O
</s>
<s>
Firefox	B-Application
has	O
an	O
integrated	O
search	O
system	O
which	O
uses	O
Google	O
by	O
default	O
in	O
most	O
markets	O
but	O
an	O
update	O
for	O
American	O
users	O
in	O
2021	O
made	O
it	O
start	O
including	O
paid	O
promotions	O
by	O
default	O
in	O
its	O
suggestions	O
.	O
</s>
<s>
DNS	B-Protocol
over	I-Protocol
HTTPS	I-Protocol
is	O
another	O
feature	O
whose	O
default	O
behaviour	O
is	O
determined	O
geographically	O
.	O
</s>
<s>
Firefox	B-Application
provides	O
an	O
environment	O
for	O
web	O
developers	O
in	O
which	O
they	O
can	O
use	O
built-in	O
tools	O
,	O
such	O
as	O
the	O
Error	O
Console	O
or	O
the	B-General_Concept
DOM	I-General_Concept
Inspector	O
,	O
and	O
extensions	B-Protocol
,	O
such	O
as	O
Firebug	B-Operating_System
and	O
more	O
recently	O
there	O
has	O
been	O
an	O
integration	O
feature	O
with	O
Pocket	B-Operating_System
.	O
</s>
<s>
Firefox	B-Application
Hello	O
was	O
an	O
implementation	O
of	O
WebRTC	B-Protocol
,	O
added	O
in	O
October	O
2014	O
,	O
which	O
allows	O
users	O
of	O
Firefox	B-Application
and	O
other	O
compatible	O
systems	O
to	O
have	O
a	O
video	O
call	O
,	O
with	O
the	O
extra	O
feature	O
of	O
screen	O
and	O
file	O
sharing	O
by	O
sending	O
a	O
link	O
to	O
each	O
other	O
.	O
</s>
<s>
Firefox	B-Application
Hello	O
was	O
scheduled	O
to	O
be	O
removed	O
in	O
September	O
2016	O
.	O
</s>
<s>
Former	O
features	O
include	O
a	O
File	B-Protocol
Transfer	I-Protocol
Protocol	I-Protocol
(	O
FTP	O
)	O
client	O
for	O
browsing	O
file	O
servers	O
,	O
the	O
ability	O
to	O
block	O
images	O
from	O
individual	O
domains	O
(	O
until	O
version	O
72	O
)	O
,	O
a	O
3D	O
page	O
inspector	O
(	O
versions	O
11	O
to	O
46	O
)	O
,	O
tab	O
grouping	O
(	O
until	O
version	O
44	O
)	O
,	O
and	O
the	O
ability	O
to	O
add	O
customized	O
extra	O
toolbars	O
(	O
until	O
version	O
28	O
)	O
.	O
</s>
<s>
Functions	O
can	O
be	O
added	O
through	O
add-ons	B-Operating_System
created	O
by	O
third-party	O
developers	O
.	O
</s>
<s>
Add-ons	B-Operating_System
are	O
primarily	O
coded	O
using	O
an	O
HTML	B-Language
,	O
CSS	B-Language
,	O
JavaScript	B-Language
,	O
with	O
API	B-General_Concept
known	O
as	O
WebExtensions	B-Operating_System
,	O
which	O
is	O
designed	O
to	O
be	O
compatible	O
with	O
Google	B-Application
Chrome	I-Application
and	O
Microsoft	B-Application
Edge	I-Application
extension	B-Protocol
systems	O
.	O
</s>
<s>
Firefox	B-Application
previously	O
supported	O
add-ons	B-Operating_System
using	O
the	O
XUL	B-Application
and	O
XPCOM	B-Application
APIs	B-General_Concept
,	O
which	O
allowed	O
them	O
to	O
directly	O
access	O
and	O
manipulate	O
much	O
of	O
the	O
browser	B-Application
's	O
internal	O
functionality	O
.	O
</s>
<s>
As	O
compatibility	O
was	O
not	O
included	O
in	O
the	O
multi-process	O
architecture	O
,	O
XUL	B-Application
add-ons	B-Operating_System
have	O
been	O
deemed	O
Legacy	O
add-ons	B-Operating_System
and	O
are	O
no	O
longer	O
supported	O
on	O
Firefox	B-Application
57	O
"	O
Quantum	B-Application
"	O
and	O
newer	O
.	O
</s>
<s>
Mozilla	B-Operating_System
has	O
occasionally	O
installed	O
extensions	B-Protocol
for	O
users	O
without	O
their	O
permission	O
.	O
</s>
<s>
This	O
happened	O
in	O
2017	O
when	O
an	O
extension	B-Protocol
designed	O
to	O
promote	O
the	O
show	O
Mr	O
Robot	O
was	O
silently	O
added	O
in	O
an	O
update	O
to	O
Firefox	B-Application
.	O
</s>
<s>
Firefox	B-Application
can	O
have	O
themes	O
added	O
to	O
it	O
,	O
which	O
users	O
can	O
create	O
or	O
download	O
from	O
third	O
parties	O
to	O
change	O
the	O
appearance	O
of	O
the	O
browser	B-Application
.	O
</s>
<s>
In	O
2013	O
,	O
Firefox	B-Application
for	I-Application
Android	I-Application
added	O
a	O
guest	O
session	O
mode	O
,	O
which	O
wiped	O
browsing	O
data	O
such	O
as	O
tabs	O
,	O
cookies	O
,	O
and	O
history	O
at	O
the	O
end	O
of	O
each	O
guest	O
session	O
.	O
</s>
<s>
Guest	O
session	O
data	O
was	O
kept	O
even	O
when	O
restarting	O
the	O
browser	B-Application
or	O
device	O
,	O
and	O
deleted	O
only	O
upon	O
a	O
manual	O
exit	O
.	O
</s>
<s>
Firefox	B-Application
implements	O
many	O
web	O
standards	O
,	O
including	O
HTML4	O
(	O
almost	O
full	O
HTML5	B-Application
)	O
,	O
XML	B-Protocol
,	O
XHTML	B-Language
,	O
MathML	B-Language
,	O
SVG	B-Application
1.1	O
(	O
full	O
)	O
,	O
SVG	B-Application
2	O
(	O
partial	O
)	O
,	O
CSS	B-Language
(	O
with	O
extensions	B-Protocol
)	O
,	O
ECMAScript	O
(	O
JavaScript	B-Language
)	O
,	O
DOM	B-General_Concept
,	O
XSLT	B-Application
,	O
XPath	B-Language
,	O
and	O
APNG	O
(	O
Animated	O
PNG	O
)	O
images	O
with	O
alpha	B-Algorithm
transparency	I-Algorithm
.	O
</s>
<s>
Firefox	B-Application
also	O
implements	O
standards	O
proposals	O
created	O
by	O
the	O
WHATWG	B-Language
such	O
as	O
client-side	O
storage	O
,	O
and	O
the	O
canvas	B-Language
element	I-Language
.	O
</s>
<s>
These	O
standards	O
are	O
implemented	O
through	O
the	O
Gecko	B-Language
layout	I-Language
engine	I-Language
,	O
and	O
SpiderMonkey	B-Language
JavaScript	B-Language
engine	O
.	O
</s>
<s>
Firefox	B-Application
4	O
was	O
the	O
first	O
release	O
to	O
introduce	O
significant	O
HTML5	B-Application
and	O
CSS3	O
support	O
.	O
</s>
<s>
Firefox	B-Application
has	O
passed	O
the	O
Acid2	O
standards-compliance	O
test	O
since	O
version	O
3.0	O
.	O
</s>
<s>
Mozilla	B-Operating_System
had	O
originally	O
stated	O
that	O
they	O
did	O
not	O
intend	O
for	O
Firefox	B-Application
to	O
pass	O
the	O
Acid3	O
test	O
fully	O
because	O
they	O
believed	O
that	O
the	O
SVG	B-Application
fonts	O
part	O
of	O
the	O
test	O
had	O
become	O
outdated	O
and	O
irrelevant	O
,	O
due	O
to	O
WOFF	O
being	O
agreed	O
upon	O
as	O
a	O
standard	O
by	O
all	O
major	O
browser	B-Application
makers	O
.	O
</s>
<s>
Because	O
the	O
SVG	B-Application
font	O
tests	O
were	O
removed	O
from	O
the	O
Acid3	O
test	O
in	O
September	O
2011	O
,	O
Firefox	B-Application
4	O
and	O
greater	O
scored	O
100/100	O
.	O
</s>
<s>
Firefox	B-Application
also	O
implements	O
"	O
Safe	O
Browsing	O
,	O
"	O
a	O
proprietary	B-Application
protocol	O
from	O
Google	O
used	O
to	O
exchange	O
data	O
related	O
with	O
phishing	O
and	O
malware	O
protection	O
.	O
</s>
<s>
Since	O
version	O
38	O
on	O
Windows	B-Application
Vista	I-Application
and	O
newer	O
,	O
Firefox	B-Application
supports	O
the	O
playback	O
of	O
video	O
content	O
protected	O
by	O
HTML5	B-Application
Encrypted	B-Language
Media	I-Language
Extensions	I-Language
(	O
EME	O
)	O
.	O
</s>
<s>
For	O
security	O
and	O
privacy	O
reasons	O
,	O
EME	O
is	O
implemented	O
within	O
a	O
wrapper	O
of	O
open-source	O
code	O
that	O
allows	O
execution	O
of	O
a	O
proprietary	B-Application
DRM	O
module	O
by	O
Adobe	O
Systems	O
—	O
Adobe	O
Primetime	O
Content	O
Decryption	O
Module	O
(	O
CDM	O
)	O
.	O
</s>
<s>
CDM	O
runs	O
within	O
a	O
"	O
sandbox	O
"	O
environment	O
to	O
limit	O
its	O
access	O
to	O
the	O
system	O
and	O
provide	O
it	O
a	O
randomized	O
device	O
ID	O
to	O
prevent	O
services	O
from	O
uniquely	B-Protocol
identifying	I-Protocol
the	I-Protocol
device	I-Protocol
for	O
tracking	O
purposes	O
.	O
</s>
<s>
The	O
DRM	O
module	O
,	O
once	O
it	O
has	O
been	O
downloaded	O
,	O
is	O
enabled	O
,	O
and	O
disabled	O
in	O
the	O
same	O
manner	O
as	O
other	O
plug-ins	B-Application
.	O
</s>
<s>
Since	O
version	O
47	O
,	O
"	O
Google	O
's	O
Widevine	O
CDM	O
on	O
Windows	O
and	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
so	O
streaming	O
services	O
like	O
Amazon	B-Application
Video	I-Application
can	O
switch	O
from	O
Silverlight	B-Application
to	O
encrypted	O
HTML5	B-Application
video	O
"	O
is	O
also	O
supported	O
.	O
</s>
<s>
Mozilla	B-Operating_System
justified	O
its	O
partnership	O
with	O
Adobe	O
and	O
Google	O
by	O
stating	O
:	O
</s>
<s>
and	O
that	O
it	O
is	O
"	O
an	O
important	O
step	O
on	O
Mozilla	B-Operating_System
's	O
roadmap	O
to	O
remove	O
NPAPI	B-Protocol
plugin	B-Application
support.	O
"	O
</s>
<s>
Upon	O
the	O
introduction	O
of	O
EME	O
support	O
,	O
builds	O
of	O
Firefox	B-Application
on	O
Windows	O
were	O
also	O
introduced	O
that	O
exclude	O
support	O
for	O
EME	O
.	O
</s>
<s>
The	B-Operating_System
Free	I-Operating_System
Software	I-Operating_System
Foundation	I-Operating_System
and	O
Cory	O
Doctorow	O
condemned	O
Mozilla	B-Operating_System
's	O
decision	O
to	O
support	O
EME	O
.	O
</s>
<s>
Firefox	B-Application
allowed	O
for	O
a	O
sandbox	O
security	O
model	O
to	O
manage	O
privileges	O
accorded	O
to	O
JavaScript	B-Language
code	O
,	O
but	O
that	O
feature	O
has	O
since	O
been	O
deprecated	O
.	O
</s>
<s>
It	O
limits	O
scripts	O
from	O
accessing	O
data	O
from	O
other	O
websites	O
based	O
on	O
the	O
same-origin	B-Protocol
policy	I-Protocol
.	O
</s>
<s>
It	O
uses	O
TLS	B-Protocol
to	O
protect	O
communications	O
with	O
web	O
servers	O
using	O
strong	O
cryptography	O
when	O
using	O
the	O
HTTPS	B-Protocol
protocol	O
.	O
</s>
<s>
The	O
freely	O
available	O
HTTPS	B-Operating_System
Everywhere	I-Operating_System
add-on	B-Operating_System
enforces	O
HTTPS	B-Protocol
,	O
even	O
if	O
a	O
regular	O
HTTP	B-Protocol
URL	O
is	O
entered	O
.	O
</s>
<s>
Firefox	B-Application
now	O
supports	O
HTTP/2	O
.	O
</s>
<s>
The	B-Operating_System
Mozilla	I-Operating_System
Foundation	I-Operating_System
offers	O
a	O
"	O
bug	O
bounty	O
"	O
(	O
US$	O
3,000	O
to	O
US$	O
7,500	O
cash	O
reward	O
)	O
to	O
researchers	O
who	O
discover	O
severe	O
security	O
holes	O
in	O
Firefox	B-Application
.	O
</s>
<s>
Because	O
Firefox	B-Application
generally	O
has	O
fewer	O
publicly	O
known	O
security	O
vulnerabilities	O
than	O
Internet	B-Application
Explorer	I-Application
(	O
see	O
Comparison	O
of	O
web	B-Application
browsers	I-Application
)	O
,	O
improved	O
security	O
is	O
often	O
cited	O
as	O
a	O
reason	O
to	O
switch	O
from	O
Internet	B-Application
Explorer	I-Application
to	O
Firefox	B-Application
.	O
</s>
<s>
The	O
Washington	O
Post	O
reported	O
that	O
exploit	O
code	O
for	O
known	O
critical	O
security	O
vulnerabilities	O
in	O
Internet	B-Application
Explorer	I-Application
was	O
available	O
for	O
284	O
days	O
in	O
2006	O
.	O
</s>
<s>
In	O
comparison	O
,	O
exploit	O
code	O
for	O
known	O
,	O
critical	O
security	O
vulnerabilities	O
in	O
Firefox	B-Application
was	O
available	O
for	O
nine	O
days	O
before	O
Mozilla	B-Operating_System
issued	O
a	O
patch	O
to	O
remedy	O
the	O
problem	O
.	O
</s>
<s>
A	O
2006	O
Symantec	O
study	O
showed	O
that	O
,	O
although	O
Firefox	B-Application
had	O
surpassed	O
other	O
browsers	B-Application
in	O
the	O
number	O
of	O
vendor-confirmed	O
vulnerabilities	O
that	O
year	O
through	O
September	O
,	O
these	O
vulnerabilities	O
were	O
patched	O
far	O
more	O
quickly	O
than	O
those	O
found	O
in	O
other	O
browsers	B-Application
,	O
with	O
Firefox	B-Application
's	O
vulnerabilities	O
being	O
fixed	O
on	O
average	O
one	O
day	O
after	O
the	O
exploit	O
code	O
was	O
made	O
available	O
,	O
as	O
compared	O
to	O
nine	O
days	O
for	O
Internet	B-Application
Explorer	I-Application
.	O
</s>
<s>
Symantec	O
later	O
clarified	O
their	O
statement	O
,	O
saying	O
that	O
Firefox	B-Application
still	O
had	O
fewer	O
security	O
vulnerabilities	O
than	O
Internet	B-Application
Explorer	I-Application
,	O
as	O
counted	O
by	O
security	O
researchers	O
.	O
</s>
<s>
In	O
October	O
2009	O
,	O
Microsoft	O
's	O
security	O
engineers	O
acknowledged	O
that	O
Firefox	B-Application
was	O
vulnerable	O
to	O
a	O
security	O
issue	O
found	O
in	O
the	O
'	O
Windows	O
Presentation	O
Foundation	O
 '	O
browser	B-Protocol
plug-in	I-Protocol
since	O
February	O
of	O
that	O
year	O
.	O
</s>
<s>
A	O
.NET	B-Application
Framework	I-Application
3.5	O
SP1	O
Windows	O
Update	O
had	O
silently	O
installed	O
the	O
vulnerable	O
plug-in	B-Application
into	O
Firefox	B-Application
.	O
</s>
<s>
In	O
2010	O
,	O
a	O
study	O
of	O
the	O
National	O
Institute	O
of	O
Standards	O
and	O
Technology	O
(	O
NIST	O
)	O
,	O
based	O
on	O
data	O
compiled	B-Language
from	O
the	O
National	O
Vulnerability	O
Database	O
(	O
NVD	O
)	O
,	O
Firefox	B-Application
was	O
listed	O
as	O
the	O
fifth-most	O
vulnerable	O
desktop	B-Application
software	O
,	O
with	O
Internet	B-Application
Explorer	I-Application
as	O
the	O
eighth	O
,	O
and	O
Google	B-Application
Chrome	I-Application
as	O
the	O
first	O
.	O
</s>
<s>
InfoWorld	O
has	O
cited	O
security	O
experts	O
saying	O
that	O
,	O
as	O
Firefox	B-Application
becomes	O
more	O
popular	O
,	O
more	O
vulnerabilities	O
will	O
be	O
found	O
,	O
a	O
claim	O
that	O
Mitchell	O
Baker	O
,	O
president	O
of	O
the	B-Operating_System
Mozilla	I-Operating_System
Foundation	I-Operating_System
,	O
has	O
denied	O
.	O
</s>
<s>
,	O
Firefox	B-Protocol
3.6	I-Protocol
had	O
no	O
known	O
unpatched	O
security	O
vulnerabilities	O
according	O
to	O
Secunia	O
.	O
</s>
<s>
Internet	B-Application
Explorer	I-Application
8	I-Application
had	O
five	O
unpatched	O
security	O
vulnerabilities	O
;	O
the	O
worst	O
being	O
rated	O
"	O
Less	O
Critical	O
"	O
by	O
Secunia	O
.	O
</s>
<s>
Mozilla	B-Operating_System
claims	O
that	O
all	O
patched	O
vulnerabilities	O
of	O
Mozilla	B-Operating_System
products	O
are	O
publicly	O
listed	O
.	O
</s>
<s>
Firefox	B-Application
11	O
,	O
released	O
in	O
January	O
2012	O
,	O
introduced	O
a	O
3D	O
page	O
inspector	O
that	O
visualizes	O
web	O
pages	O
 '	O
document	B-General_Concept
object	I-General_Concept
model	I-General_Concept
three-dimensionally	O
through	O
WebGL	B-Library
.	O
</s>
<s>
On	O
January	O
28	O
,	O
2013	O
,	O
Mozilla	B-Operating_System
was	O
recognized	O
as	O
the	O
most	O
trusted	O
internet	O
company	O
for	O
privacy	O
in	O
2012	O
.	O
</s>
<s>
In	O
February	O
2013	O
,	O
plans	O
were	O
announced	O
for	O
Firefox	B-Application
22	O
to	O
disable	O
third-party	O
cookies	O
by	O
default	O
.	O
</s>
<s>
However	O
,	O
the	O
introduction	O
of	O
the	O
feature	O
was	O
then	O
delayed	O
so	O
Mozilla	B-Operating_System
developers	O
could	O
"	O
collect	O
and	O
analyze	O
data	O
on	O
the	O
effect	O
of	O
blocking	O
some	O
third-party	O
cookies.	O
"	O
</s>
<s>
Mozilla	B-Operating_System
also	O
collaborated	O
with	O
Stanford	O
University	O
's	O
"	O
Cookie	O
Clearinghouse	O
"	O
project	O
to	O
develop	O
a	O
blacklist	O
and	O
whitelist	O
of	O
sites	O
that	O
will	O
be	O
used	O
in	O
the	O
filter	O
.	O
</s>
<s>
Version	O
23	O
,	O
released	O
in	O
August	O
2013	O
,	O
followed	O
the	O
lead	O
of	O
its	O
competitors	O
by	O
blocking	O
iframe	O
,	O
stylesheet	O
,	O
and	O
script	O
resources	O
served	O
from	O
non-HTTPS	O
servers	O
embedded	O
on	O
HTTPS	B-Protocol
pages	O
by	O
default	O
.	O
</s>
<s>
Additionally	O
,	O
JavaScript	B-Language
could	O
also	O
no	O
longer	O
be	O
disabled	O
through	O
Firefox	B-Application
's	O
preferences	O
,	O
and	O
JavaScript	B-Language
was	O
automatically	O
re-enabled	O
for	O
users	O
who	O
upgraded	O
to	O
23	O
or	O
higher	O
with	O
it	O
disabled	O
.	O
</s>
<s>
The	O
change	O
was	O
made	O
due	O
to	O
its	O
use	O
across	O
the	O
majority	O
of	O
websites	O
,	O
the	O
potential	O
repercussions	O
on	O
inexperienced	O
users	O
who	O
are	O
unaware	O
of	O
its	O
impact	O
,	O
along	O
with	O
the	O
availability	O
of	O
extensions	B-Protocol
such	O
as	O
NoScript	B-Operating_System
,	O
which	O
can	O
disable	O
JavaScript	B-Language
in	O
a	O
more	O
controlled	O
fashion	O
.	O
</s>
<s>
The	O
following	O
release	O
added	O
the	O
ability	O
to	O
disable	O
JavaScript	B-Language
through	O
the	O
developer	O
tools	O
for	O
testing	O
purposes	O
.	O
</s>
<s>
In	O
January	O
2015	O
,	O
TorrentFreak	O
reported	O
that	O
using	O
Firefox	B-Application
when	O
connected	O
to	O
the	O
internet	O
using	O
a	O
VPN	O
can	O
be	O
a	O
serious	O
security	O
issue	O
due	O
to	O
the	O
browser	B-Application
's	O
support	O
for	O
WebRTC	B-Protocol
.	O
</s>
<s>
Beginning	O
with	O
Firefox	B-Application
48	O
,	O
all	O
extensions	B-Protocol
must	O
be	O
signed	O
by	O
Mozilla	B-Operating_System
to	O
be	O
used	O
in	O
release	O
and	O
beta	O
versions	O
of	O
Firefox	B-Application
.	O
</s>
<s>
Firefox	B-Application
43	O
blocked	O
unsigned	O
extensions	B-Protocol
but	O
allowed	O
enforcement	O
of	O
extension	B-Protocol
signing	O
to	O
be	O
disabled	O
.	O
</s>
<s>
All	O
extensions	B-Protocol
must	O
be	O
submitted	O
to	O
Mozilla	B-Operating_System
Add-ons	B-Operating_System
and	O
be	O
subject	O
to	O
code	O
analysis	O
in	O
order	O
to	O
be	O
signed	O
,	O
although	O
extensions	B-Protocol
do	O
not	O
have	O
to	O
be	O
listed	O
on	O
the	O
service	O
to	O
be	O
signed	O
.	O
</s>
<s>
On	O
May	O
2	O
,	O
2019	O
,	O
Mozilla	B-Operating_System
announced	O
that	O
it	O
would	O
be	O
strengthening	O
the	O
signature	O
enforcement	O
with	O
methods	O
that	O
included	O
the	O
retroactive	O
disabling	O
of	O
old	O
extensions	B-Protocol
now	O
deemed	O
to	O
be	O
insecure	O
.	O
</s>
<s>
A	O
Firefox	B-Application
update	O
on	O
May	O
3	O
led	O
to	O
bug	O
reports	O
about	O
all	O
extensions	B-Protocol
being	O
disabled	O
.	O
</s>
<s>
In	O
Firefox	B-Application
versions	O
prior	O
to	O
7.0	O
,	O
an	O
information	O
bar	O
appears	O
on	O
the	O
browser	B-Application
's	O
first	O
start	O
asking	O
users	O
whether	O
they	O
would	O
like	O
to	O
send	O
performance	O
statistics	O
,	O
or	O
"	O
telemetry	O
"	O
,	O
to	O
Mozilla	B-Operating_System
.	O
</s>
<s>
It	O
is	O
enabled	O
by	O
default	O
in	O
development	O
versions	O
of	O
Firefox	B-Application
,	O
but	O
not	O
in	O
release	O
versions	O
.	O
</s>
<s>
According	O
to	O
Mozilla	B-Operating_System
's	O
privacy	O
policy	O
,	O
these	O
statistics	O
are	O
stored	O
only	O
in	O
aggregate	O
format	O
,	O
and	O
the	O
only	O
personally	O
identifiable	O
information	O
transmitted	O
is	O
the	O
user	O
's	O
IP	B-Protocol
address	I-Protocol
.	O
</s>
<s>
In	O
November	O
2018	O
,	O
Firefox	B-Application
began	O
using	O
a	O
sandbox	O
to	O
isolate	O
web	O
tabs	O
from	O
each	O
other	O
and	O
from	O
the	O
rest	O
of	O
the	O
system	O
.	O
</s>
<s>
Its	O
lack	O
of	O
such	O
a	O
feature	O
had	O
previously	O
earned	O
it	O
negative	O
comparisons	O
with	O
Google	B-Application
Chrome	I-Application
and	O
Microsoft	B-Application
Edge	I-Application
.	O
</s>
<s>
Since	O
version	O
60	O
Firefox	B-Application
includes	O
the	O
option	O
to	O
use	O
DNS	B-Protocol
over	I-Protocol
HTTPS	I-Protocol
(	O
DoH	O
)	O
,	O
which	O
causes	O
DNS	B-Protocol
lookup	I-Protocol
requests	O
to	O
be	O
sent	O
encrypted	O
over	O
the	O
HTTPS	B-Protocol
protocol	O
.	O
</s>
<s>
To	O
use	O
this	O
feature	O
the	O
user	O
must	O
set	O
certain	O
preferences	O
beginning	O
with	O
"	O
network.trr	O
"	O
(	O
Trusted	O
Recursive	O
Resolver	O
)	O
in	O
about:config	O
:	O
if	O
network.trr.mode	O
is	O
0	O
,	O
DoH	O
is	O
disabled	O
;	O
1	O
activates	O
DoH	O
in	O
addition	O
to	O
unencrypted	O
DNS	B-Protocol
;	O
2	O
causes	O
DoH	O
to	O
be	O
used	O
before	O
unencrypted	O
DNS	B-Protocol
;	O
to	O
use	O
only	O
DoH	O
,	O
the	O
value	O
must	O
be	O
3	O
.	O
</s>
<s>
By	O
setting	O
network.trr.uri	O
to	O
the	O
URL	O
,	O
special	O
Cloudflare	B-Application
servers	O
will	O
be	O
activated	O
.	O
</s>
<s>
Mozilla	B-Operating_System
has	O
a	O
privacy	O
agreement	O
with	O
this	O
server	O
host	O
that	O
restricts	O
their	O
collection	O
of	O
information	O
about	O
incoming	O
DNS	B-Protocol
requests	O
.	O
</s>
<s>
On	O
May	O
21	O
,	O
2019	O
,	O
Firefox	B-Application
was	O
updated	O
to	O
include	O
the	O
ability	O
to	O
block	O
scripts	O
that	O
used	O
a	O
computer	O
's	O
CPU	B-General_Concept
to	O
mine	O
cryptocurrency	O
without	O
a	O
user	O
's	O
permission	O
,	O
in	O
Firefox	B-Application
version	O
67.0	O
.	O
</s>
<s>
The	O
update	O
also	O
allowed	O
users	O
to	O
block	O
known	O
fingerprinting	B-Protocol
scripts	O
that	O
track	O
their	O
activity	O
across	O
the	O
web	O
,	O
however	O
it	O
does	O
not	O
resist	O
fingerprinting	B-Protocol
on	O
its	O
own	O
.	O
</s>
<s>
On	O
July	O
2	O
,	O
2019	O
,	O
Mozilla	B-Operating_System
introduced	O
a	O
mechanism	O
to	O
allow	O
Firefox	B-Application
to	O
automatically	O
trust	O
OS-installed	O
certificates	O
to	O
prevent	O
TLS	B-Protocol
errors	O
.	O
</s>
<s>
In	O
October	O
2019	O
,	O
ZDNet	O
reported	O
Firefox	B-Application
version	O
68	O
ESR	O
passed	O
all	O
minimum	O
requirements	O
for	O
mandatory	O
security	O
features	O
during	O
an	O
exam	O
by	O
the	O
Federal	O
Office	O
for	O
Information	O
Security	O
of	O
Germany	O
.	O
</s>
<s>
In	O
Mozilla	B-Operating_System
Foundation	I-Operating_System
Security	O
Advisory	O
2020	O
–	O
03	O
,	O
the	O
company	O
reported	O
that	O
the	O
vulnerability	O
(	O
type	O
confusion	O
vulnerability	O
in	O
IonMonkey	O
)	O
had	O
been	O
detected	O
in	O
the	O
wild	O
and	O
was	O
being	O
actively	O
exploited	O
.	O
</s>
<s>
In	O
March	O
2021	O
,	O
Firefox	B-Application
launched	O
SmartBlock	O
in	O
version	O
87	O
to	O
offer	O
protection	O
against	O
cross-site	B-Application
tracking	I-Application
,	O
without	O
breaking	O
the	O
websites	O
users	O
visit	O
.	O
</s>
<s>
Also	O
known	O
as	O
state	O
partitioning	O
or	O
"	O
total	O
cookie	O
protection	O
"	O
,	O
works	O
via	O
a	O
feature	O
in	O
the	O
browser	B-Application
that	O
isolates	O
data	O
from	O
each	O
site	O
visited	O
by	O
the	O
user	O
to	O
ensure	O
that	O
cross-site	O
scripting	O
is	O
very	O
difficult	O
if	O
not	O
impossible	O
.	O
</s>
<s>
Firefox	B-Application
is	O
a	O
widely	O
localized	B-General_Concept
web	B-Application
browser	I-Application
.	O
</s>
<s>
The	O
first	O
official	O
release	O
in	O
November	O
2004	O
was	O
available	O
in	O
24	O
different	O
languages	O
and	O
for	O
28	O
locales	B-Device
,	O
including	O
British	O
English	O
,	O
American	O
English	O
,	O
European	O
Spanish	O
,	O
Argentine	O
Spanish	O
,	O
Chinese	O
in	O
Traditional	O
Chinese	O
characters	O
and	O
Simplified	O
Chinese	O
characters	O
and	O
in	O
Bengali	O
script	O
.	O
</s>
<s>
,	O
currently	O
supported	O
versions	O
112.0.1	O
and	O
102.10.0esr	O
are	O
available	O
in	O
97	O
locales	B-Device
(	O
88	O
languages	O
)	O
.	O
</s>
<s>
The	O
desktop	B-Application
version	O
of	O
Firefox	B-Application
is	O
available	O
and	O
supports	O
Microsoft	O
Windows	O
,	O
macOS	B-Operating_System
,	O
and	O
Linux	B-Application
,	O
while	O
Firefox	B-Application
for	I-Application
Android	I-Application
is	O
available	O
for	O
Android	B-Application
(	O
formerly	O
Firefox	B-Application
for	I-Application
mobile	I-Application
,	O
it	O
also	O
ran	O
on	O
Maemo	B-Operating_System
,	O
MeeGo	B-Operating_System
and	O
Firefox	B-Operating_System
OS	I-Operating_System
)	O
and	O
Firefox	B-Application
for	I-Application
iOS	I-Application
is	O
available	O
for	O
iOS	B-Application
.	O
</s>
<s>
Smartphones	O
that	O
support	B-Application
Linux	I-Application
but	O
do	O
n't	O
support	O
Android	B-Application
or	O
iOS	B-Application
apps	I-Application
can	O
also	O
run	O
Firefox	B-Application
in	O
its	O
desktop	B-Application
version	O
,	O
for	O
example	O
using	O
postmarketOS	B-Application
.	O
</s>
<s>
Firefox	B-Application
source	O
code	O
may	O
be	O
compiled	B-Language
for	O
various	O
operating	O
systems	O
;	O
however	O
,	O
officially	O
distributed	O
binaries	O
are	O
provided	O
for	O
the	O
following	O
:	O
</s>
<s>
+	O
Required	O
hardware	O
and	O
software	O
Requirement	O
Microsoft	O
Windows	O
Linux	B-Application
desktop	B-Application
macOS	B-Operating_System
Android	B-Application
iOS	B-Application
CPU	B-General_Concept
Pentium	B-General_Concept
4	I-General_Concept
or	O
newer	O
with	O
SSE2	B-General_Concept
(	O
or	O
ARM64	B-Architecture
for	O
Windows	O
)	O
Any	O
x86-64	B-Device
and	O
ARM64	B-Architecture
CPU	B-General_Concept
ARMv7	O
,	O
ARM64	B-Architecture
,	O
IA-32	B-Device
and	O
x64	B-Device
ARM64	B-Architecture
Memory	O
(	O
RAM	B-Architecture
)	O
512	O
MB	O
for	O
the	O
32-bit	O
version	O
and	O
2	O
GB	O
for	O
the	O
64-bit	O
version	O
384	O
MB	O
?	O
</s>
<s>
Firefox	B-Application
1.0	O
was	O
released	O
for	O
Windows	O
9x	O
,	O
as	O
well	O
as	O
Windows	B-Device
NT	I-Device
4.0	I-Device
and	O
later	O
.	O
</s>
<s>
Some	O
users	O
reported	O
the	O
1.x	O
builds	O
were	O
operable	O
(	O
but	O
not	O
installable	O
)	O
on	O
Windows	B-Device
NT	I-Device
3.51	I-Device
.	O
</s>
<s>
The	O
version	O
42.0	O
release	O
includes	O
the	O
first	O
x64	B-Device
build	O
.	O
</s>
<s>
It	O
requires	O
Windows	B-Device
7	I-Device
and	O
Server	B-Device
2008	I-Device
R2	I-Device
.	O
</s>
<s>
Starting	O
from	O
version	O
49.0	O
,	O
Firefox	B-Application
for	O
Windows	O
requires	O
and	O
uses	O
the	O
SSE2	B-General_Concept
instruction	O
set	O
.	O
</s>
<s>
In	O
September	O
2013	O
,	O
Mozilla	B-Operating_System
released	O
a	O
Metro-style	O
version	O
of	O
Firefox	B-Application
,	O
optimized	O
for	O
touchscreen	B-Device
use	O
,	O
on	O
the	O
"	O
Aurora	O
"	O
release	O
channel	O
.	O
</s>
<s>
However	O
,	O
on	O
March	O
14	O
,	O
2014	O
,	O
Mozilla	B-Operating_System
cancelled	O
the	O
project	O
because	O
of	O
a	O
lack	O
of	O
user	O
adoption	O
.	O
</s>
<s>
In	O
April	O
2017	O
,	O
users	O
of	O
Firefox	B-Application
52.0.2	O
on	O
Windows	B-Application
XP	I-Application
,	O
Windows	B-Application
Vista	I-Application
,	O
Windows	B-Application
Server	I-Application
2003	I-Application
and	O
Windows	B-Device
Server	I-Device
2008	I-Device
who	O
had	O
automatic	O
updates	O
enabled	O
were	O
migrated	O
to	O
Firefox	B-Application
52	O
ESR	O
.	O
</s>
<s>
Traditionally	O
,	O
installing	O
the	O
Windows	O
version	O
of	O
Firefox	B-Application
entails	O
visiting	O
the	O
Firefox	B-Application
website	O
and	O
downloading	O
an	O
installer	O
package	O
,	O
depending	O
on	O
the	O
desired	O
localization	O
and	O
system	O
architecture	O
.	O
</s>
<s>
In	O
November	O
2021	O
,	O
Mozilla	B-Operating_System
made	O
Firefox	B-Application
available	O
on	O
Microsoft	B-Application
Store	I-Application
.	O
</s>
<s>
The	O
first	O
official	O
release	O
(	O
Firefox	B-Application
version	O
1.0	O
)	O
supported	O
macOS	B-Operating_System
(	O
then	O
called	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
)	O
on	O
the	O
PowerPC	B-Architecture
architecture	O
.	O
</s>
<s>
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
builds	O
for	O
the	O
IA-32	B-Device
architecture	O
became	O
available	O
via	O
a	O
universal	B-Operating_System
binary	I-Operating_System
which	O
debuted	O
with	O
Firefox	B-Application
1.5.0.2	O
in	O
2006	O
.	O
</s>
<s>
Starting	O
with	O
version	O
4.0	O
,	O
Firefox	B-Application
was	O
released	O
for	O
the	O
x64	B-Device
architecture	I-Device
to	O
which	O
macOS	B-Operating_System
had	O
migrated	O
.	O
</s>
<s>
Version	O
4.0	O
also	O
dropped	O
support	O
for	O
PowerPC	B-Architecture
architecture	O
,	O
although	O
other	O
projects	O
continued	O
development	O
of	O
a	O
PowerPC	B-Architecture
version	O
of	O
Firefox	B-Application
.	O
</s>
<s>
Firefox	B-Application
was	O
originally	O
released	O
for	O
Mac	O
OS	O
X	O
10.0	O
and	O
higher	O
.	O
</s>
<s>
The	O
minimum	O
OS	O
then	O
increased	O
to	O
Mac	O
OS	O
X	O
10.2	O
in	O
Firefox	B-Application
1.5	O
and	O
10.4	O
in	O
Firefox	B-Application
3	O
.	O
</s>
<s>
Firefox	B-Application
4	O
dropped	O
support	O
for	O
Mac	O
OS	O
X	O
10.4	O
and	O
PowerPC	B-Architecture
Macs	O
,	O
and	O
Firefox	B-Application
17	O
dropped	O
support	O
for	O
Mac	O
OS	O
X	O
10.5	O
entirely	O
.	O
</s>
<s>
The	O
system	O
requirements	O
were	O
left	O
unchanged	O
until	O
2016	O
,	O
when	O
Firefox	B-Application
49	O
dropped	O
support	O
for	O
Mac	O
OS	O
X	O
10.6	O
–	O
10.8	O
.	O
</s>
<s>
Most	O
recently	O
,	O
Mozilla	B-Operating_System
ended	O
support	O
for	O
OS	B-Operating_System
X	I-Operating_System
10.9	O
–	O
10.11	O
in	O
Firefox	B-Application
79	O
,	O
with	O
those	O
users	O
being	O
supported	O
on	O
the	O
Firefox	B-Application
78	O
ESR	O
branch	O
until	O
November	O
2021	O
.	O
</s>
<s>
Since	O
its	O
inception	O
,	O
Firefox	B-Application
for	O
Linux	B-Application
supported	O
the	O
32-bit	O
memory	O
architecture	O
of	O
the	O
IA-32	B-Device
instruction	O
set	O
.	O
</s>
<s>
The	O
46.0	O
release	O
replaced	O
GTK	B-Application
2.18	O
with	O
3.4	O
as	O
a	O
system	O
requirement	O
on	O
Linux	B-Application
and	O
other	O
systems	O
running	O
X.Org	B-Operating_System
.	O
</s>
<s>
Starting	O
with	O
53.0	O
,	O
the	O
32-bit	O
builds	O
require	O
the	O
SSE2	B-General_Concept
instruction	O
set	O
.	O
</s>
<s>
Firefox	B-Application
also	O
can	O
run	O
on	O
number	O
of	O
other	O
architectures	O
on	O
Linux	B-Application
,	O
including	O
ARM	B-Architecture
,	O
AArch64	B-Architecture
,	O
PowerPC	B-Architecture
,	O
POWER	B-Architecture
,	O
Sparc	B-Architecture
,	O
HPPA	B-Device
,	O
MIPS	B-Device
,	O
s390	B-Device
,	O
and	O
in	O
the	O
past	O
Alpha	B-Device
,	O
IA-64	B-General_Concept
(	O
Intel	O
Itanium	O
)	O
and	O
m68k	B-Device
.	O
</s>
<s>
Firefox	B-Application
for	I-Application
mobile	I-Application
,	O
codenamed	O
"	O
Fennec	B-Application
"	O
,	O
was	O
first	O
released	O
for	O
Maemo	B-Operating_System
in	O
January	O
2010	O
with	O
version	O
1.0	O
and	O
for	O
Android	B-Application
in	O
March	O
2011	O
with	O
version	O
4.0	O
.	O
</s>
<s>
Support	O
for	O
Maemo	B-Operating_System
was	O
discontinued	O
after	O
version	O
7	O
,	O
released	O
in	O
September	O
2011	O
.	O
</s>
<s>
Fennec	B-Application
had	O
a	O
user	B-Application
interface	I-Application
optimized	O
for	O
phones	O
and	O
tablets	O
.	O
</s>
<s>
It	O
included	O
the	O
Awesome	O
Bar	O
,	O
tabbed	O
browsing	O
,	O
add-on	B-Operating_System
support	O
,	O
a	O
password	O
manager	O
,	O
location-aware	O
browsing	O
,	O
and	O
the	O
ability	O
to	O
synchronize	O
with	O
the	O
user	O
's	O
other	O
devices	O
with	O
Mozilla	B-Application
Firefox	I-Application
using	O
Firefox	B-Operating_System
Sync	I-Operating_System
.	O
</s>
<s>
It	O
was	O
criticized	O
for	O
being	O
slow	O
,	O
however	O
,	O
in	O
part	O
due	O
to	O
its	O
poor	O
port	O
of	O
Gecko	B-Language
.	O
</s>
<s>
At	O
the	O
end	O
of	O
its	O
existence	O
,	O
it	O
had	O
a	O
market	O
share	O
of	O
0.5	O
%	O
on	O
Android	B-Application
.	O
</s>
<s>
In	O
August	O
2020	O
,	O
Mozilla	B-Operating_System
launched	O
a	O
new	O
version	O
of	O
its	O
Firefox	B-Application
for	I-Application
Android	I-Application
app	O
,	O
named	O
Firefox	B-Application
Daylight	I-Application
to	O
the	O
public	O
and	O
codenamed	O
Fenix	B-Application
,	O
after	O
a	O
little	O
over	O
a	O
year	O
of	O
testing	O
.	O
</s>
<s>
It	O
boasted	O
higher	O
speeds	O
with	O
its	O
new	O
GeckoView	B-Language
engine	O
,	O
which	O
is	O
described	O
as	O
being	O
"	O
the	O
only	O
independent	O
web	B-Protocol
engine	I-Protocol
browser	I-Protocol
available	O
on	O
Android	B-Application
"	O
.	O
</s>
<s>
However	O
,	O
it	O
was	O
criticized	O
for	O
only	O
having	O
nine	O
Add-ons	B-Operating_System
at	O
launch	O
,	O
and	O
missing	O
certain	O
features	O
.	O
</s>
<s>
In	O
response	O
,	O
Mozilla	B-Operating_System
stated	O
that	O
they	O
will	O
allow	O
more	O
Add-ons	B-Operating_System
with	O
time	O
.	O
</s>
<s>
Mozilla	B-Operating_System
initially	O
refused	O
to	O
port	O
Firefox	B-Application
to	O
iOS	B-Application
,	O
due	O
to	O
the	O
restrictions	O
Apple	O
imposed	O
on	O
third-party	O
iOS	B-Application
browsers	B-Application
.	O
</s>
<s>
Instead	O
of	O
releasing	O
a	O
full	O
version	O
of	O
the	O
Firefox	B-Application
browser	I-Application
,	O
Mozilla	B-Operating_System
released	O
Firefox	B-Application
Home	O
,	O
a	O
companion	O
app	O
for	O
the	O
iPhone	O
and	O
iPod	O
Touch	O
based	O
on	O
the	O
Firefox	B-Operating_System
Sync	I-Operating_System
technology	O
,	O
which	O
allowed	O
users	O
to	O
access	O
their	O
Firefox	B-Application
browsing	O
history	O
,	O
bookmarks	O
,	O
and	O
recent	O
tabs	O
.	O
</s>
<s>
It	O
also	O
included	O
Firefox	B-Application
's	O
"	O
Awesomebar	O
"	O
location	O
bar	O
.	O
</s>
<s>
Firefox	B-Application
Home	O
was	O
not	O
a	O
web	B-Application
browser	I-Application
,	O
the	O
application	O
launched	O
web	O
pages	O
in	O
either	O
an	O
embedded	O
viewer	O
for	O
that	O
one	O
page	O
,	O
or	O
by	O
opening	O
the	O
page	O
in	O
the	O
Safari	B-Application
app	O
.	O
</s>
<s>
Mozilla	B-Operating_System
pulled	O
Firefox	B-Application
Home	O
from	O
the	O
App	B-Application
Store	I-Application
in	O
September	O
2012	O
,	O
stating	O
it	O
would	O
focus	O
its	O
resources	O
on	O
other	O
projects	O
.	O
</s>
<s>
The	O
company	O
subsequently	O
released	O
the	O
source	O
code	O
of	O
Firefox	B-Application
Home	O
's	O
underlying	O
synchronization	O
software	O
.	O
</s>
<s>
In	O
April	O
2013	O
,	O
then-Mozilla	O
CEO	O
Gary	O
Kovacs	O
said	O
that	O
Firefox	B-Application
would	O
not	O
come	O
to	O
iOS	B-Application
if	O
Apple	O
required	O
the	O
use	O
of	O
the	O
WebKit	B-Language
layout	B-Protocol
engine	I-Protocol
to	O
do	O
so	O
.	O
</s>
<s>
One	O
reason	O
given	O
by	O
Mozilla	B-Operating_System
was	O
that	O
prior	O
to	O
iOS	B-Application
8	O
,	O
Apple	O
had	O
supplied	O
third-party	O
browsers	B-Application
with	O
an	O
inferior	O
version	O
of	O
their	O
JavaScript	B-Language
engine	O
which	O
hobbled	O
their	O
performance	O
,	O
making	O
it	O
impossible	O
to	O
match	O
Safari	B-Application
's	O
JavaScript	B-Language
performance	O
on	O
the	O
iOS	B-Application
platform	O
.	O
</s>
<s>
Apple	O
later	O
opened	O
their	O
"	O
Nitro	O
"	O
JavaScript	B-Language
engine	O
to	O
third-party	O
browsers	B-Application
.	O
</s>
<s>
In	O
2015	O
,	O
Mozilla	B-Operating_System
announced	O
it	O
was	O
moving	O
forward	O
with	O
Firefox	B-Application
for	I-Application
iOS	I-Application
,	O
with	O
a	O
preview	O
release	O
made	O
available	O
in	O
New	O
Zealand	O
in	O
September	O
of	O
that	O
year	O
.	O
</s>
<s>
It	O
is	O
the	O
first	O
Firefox-branded	O
browser	B-Application
not	O
to	O
use	O
the	O
Gecko	B-Language
layout	I-Language
engine	I-Language
as	O
is	O
used	O
in	O
Firefox	B-Application
for	O
desktop	B-Application
and	O
mobile	B-Application
.	O
</s>
<s>
Apple	O
's	O
policies	O
require	O
all	O
iOS	B-Application
apps	I-Application
that	O
browse	O
the	O
web	O
to	O
use	O
the	O
built-in	O
WebKit	B-Language
rendering	O
framework	O
and	O
WebKit	B-Language
JavaScript	B-Language
,	O
so	O
using	O
Gecko	B-Language
is	O
not	O
possible	O
.	O
</s>
<s>
Unlike	O
Firefox	B-Application
on	I-Application
Android	I-Application
,	O
Firefox	B-Application
for	I-Application
iOS	I-Application
does	O
not	O
support	O
browser	B-Protocol
add-ons	I-Protocol
.	O
</s>
<s>
In	O
November	O
2016	O
,	O
Firefox	B-Application
released	O
a	O
new	O
iOS	B-Application
app	I-Application
titled	O
Firefox	B-Operating_System
Focus	I-Operating_System
,	O
a	O
private	O
web	B-Application
browser	I-Application
.	O
</s>
<s>
Firefox	B-Application
Reality	O
was	O
released	O
for	O
Augmented	O
Reality	O
and	O
Virtual	O
Reality	O
headsets	O
in	O
September	O
2018	O
.	O
</s>
<s>
Firefox	B-Application
Reality	O
is	O
available	O
on	O
HTC	O
Vive	O
,	O
Oculus	B-Application
,	O
Google	B-Application
Daydream	I-Application
and	O
Microsoft	B-General_Concept
Hololens	I-General_Concept
headsets	O
.	O
</s>
<s>
In	O
February	O
2022	O
Mozilla	B-Operating_System
announced	O
that	O
Igalia	O
took	O
over	O
stewardship	O
of	O
this	O
project	O
under	O
the	O
new	O
name	O
of	O
Wolvic	O
.	O
</s>
<s>
Firefox	B-Application
has	O
also	O
been	O
ported	O
to	O
FreeBSD	B-Operating_System
,	O
NetBSD	B-Device
,	O
OpenBSD	B-Operating_System
,	O
OpenIndiana	B-Application
,	O
OS/2	B-Application
,	O
ArcaOS	B-Device
,	O
SkyOS	B-Application
,	O
RISC	B-Operating_System
OS	I-Operating_System
and	O
BeOS/Haiku	O
,	O
and	O
an	O
unofficial	O
rebranded	O
version	O
called	O
Timberwolf	B-Operating_System
has	O
been	O
available	O
for	O
AmigaOS	B-Application
4	I-Application
.	O
</s>
<s>
An	O
unofficial	O
continuation	O
of	O
the	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
PowerPC	B-Architecture
release	O
was	O
actively	O
developed	O
as	O
TenFourFox	B-Operating_System
until	O
October	O
5	O
,	O
2021	O
.	O
</s>
<s>
The	O
Firefox	B-Application
port	O
for	O
OpenBSD	B-Operating_System
is	O
maintained	O
by	O
Landry	O
Breuil	O
since	O
2010	O
.	O
</s>
<s>
Firefox	B-Application
is	O
regularly	O
built	O
for	O
the	O
current	O
branch	O
of	O
the	O
operating	O
system	O
,	O
the	O
latest	O
versions	O
are	O
packaged	O
for	O
each	O
release	O
and	O
remain	O
frozen	O
until	O
the	O
next	O
release	O
.	O
</s>
<s>
In	O
2017	O
,	O
Landry	O
began	O
hosting	O
packages	O
of	O
newer	O
Firefox	B-Application
versions	O
for	O
OpenBSD	B-Operating_System
releases	O
from	O
6.0	O
onwards	O
,	O
making	O
them	O
available	O
to	O
installations	O
without	O
the	O
ports	O
system	O
.	O
</s>
<s>
The	O
Solaris	B-Application
port	O
of	O
Firefox	B-Application
(	O
including	O
OpenSolaris	B-Operating_System
)	O
was	O
maintained	O
by	O
the	O
Oracle	B-Application
Solaris	I-Application
Desktop	B-Application
Beijing	O
Team	O
,	O
until	O
March	O
2017	O
when	O
the	O
team	O
was	O
disbanded	O
.	O
</s>
<s>
There	O
was	O
also	O
an	O
unofficial	O
port	O
of	O
Firefox	O
3.6.x	O
to	O
IBM	B-Application
AIX	I-Application
and	O
of	O
v1.7.x	O
to	O
UnixWare	B-Operating_System
.	O
</s>
<s>
Besides	O
official	O
releases	O
,	O
Mozilla	B-Operating_System
provides	O
development	O
builds	O
of	O
Firefox	B-Application
in	O
distribution	O
channels	O
named	O
,	O
in	O
order	O
of	O
most	O
to	O
least	O
stable	O
,	O
"	O
Beta	O
"	O
,	O
"	O
Developer	O
Edition	O
"	O
(	O
formerly	O
"	O
Aurora	O
"	O
,	O
renamed	O
on	O
November	O
10	O
,	O
2014	O
)	O
,	O
and	O
"	O
Nightly	O
"	O
.	O
</s>
<s>
Starting	O
from	O
Firefox	B-Application
54	O
,	O
"	O
Developer	O
Edition	O
"	O
is	O
based	O
on	O
the	O
"	O
Beta	O
"	O
build	O
.	O
</s>
<s>
Firefox	B-Application
ESR	O
(	O
)	O
is	O
a	O
version	O
of	O
Firefox	B-Application
for	O
organizations	O
and	O
other	O
groups	O
that	O
need	O
extended	O
support	O
for	O
mass	O
deployments	O
.	O
</s>
<s>
Firefox	B-Application
source	O
code	O
is	O
free	B-Application
software	I-Application
,	O
with	O
most	O
of	O
it	O
being	O
released	O
under	O
the	O
Mozilla	B-License
Public	I-License
License	I-License
(	O
MPL	O
)	O
version	O
2.0	O
.	O
</s>
<s>
As	O
a	O
result	O
,	O
several	O
publicly	O
released	O
applications	O
have	O
been	O
built	O
from	O
it	O
,	O
such	O
as	O
Netscape	B-Protocol
,	O
Flock	B-Protocol
,	O
Miro	B-Language
,	O
GNU	B-Application
IceCat	I-Application
,	O
Iceweasel	B-Operating_System
,	O
Songbird	B-Application
,	O
Pale	B-Protocol
Moon	I-Protocol
,	O
Waterfox	B-Language
,	O
and	O
Comodo	B-Operating_System
IceDragon	I-Operating_System
.	O
</s>
<s>
In	O
the	O
past	O
,	O
Firefox	B-Application
was	O
licensed	O
solely	O
under	O
the	O
MPL	O
,	O
then	O
version	O
1.1	O
,	O
which	O
the	B-Operating_System
Free	I-Operating_System
Software	I-Operating_System
Foundation	I-Operating_System
criticized	O
for	O
being	O
weak	O
copyleft	O
,	O
as	O
the	O
license	O
permitted	O
,	O
in	O
limited	O
ways	O
,	O
proprietary	B-Application
derivative	O
works	O
.	O
</s>
<s>
Additionally	O
,	O
code	O
only	O
licensed	O
under	O
MPL	B-License
1.1	I-License
could	O
not	O
legally	O
be	O
linked	O
with	O
code	O
under	O
the	O
GPL	B-License
.	O
</s>
<s>
To	O
address	O
these	O
concerns	O
,	O
Mozilla	B-Operating_System
re-licensed	O
most	O
of	O
Firefox	B-Application
under	O
the	O
tri-license	B-License
scheme	O
of	O
MPL	B-License
1.1	I-License
,	O
GPL	B-License
2.0	O
,	O
or	O
LGPL	B-Application
2.1	I-Application
.	O
</s>
<s>
Since	O
the	O
re-licensing	O
,	O
developers	O
were	O
free	O
to	O
choose	O
the	O
license	O
under	O
which	O
they	O
received	O
most	O
of	O
the	O
code	O
,	O
to	O
suit	O
their	O
intended	O
use	O
:	O
GPL	B-License
or	O
LGPL	B-Application
linking	O
and	O
derivative	O
works	O
when	O
one	O
of	O
those	O
licenses	O
is	O
chosen	O
,	O
or	O
MPL	O
use	O
(	O
including	O
the	O
possibility	O
of	O
proprietary	B-Application
derivative	O
works	O
)	O
if	O
they	O
chose	O
the	O
MPL	O
.	O
</s>
<s>
However	O
,	O
on	O
January	O
3	O
,	O
2012	O
,	O
Mozilla	B-Operating_System
released	O
the	O
GPL-compatible	O
MPL	B-License
2.0	I-License
,	O
and	O
with	O
the	O
release	O
of	O
Firefox	B-Application
13	O
on	O
June	O
5	O
,	O
2012	O
,	O
Mozilla	B-Operating_System
used	O
it	O
to	O
replace	O
the	O
tri-licensing	O
scheme	O
.	O
</s>
<s>
The	O
crash	O
reporting	O
service	O
was	O
initially	O
closed-source	B-Application
but	O
switched	O
with	O
version	O
3	O
from	O
a	O
program	O
called	O
Talkback	O
to	O
the	O
open-source	O
Breakpad	O
(	O
and	O
Socorro	O
server	O
)	O
.	O
</s>
<s>
The	O
name	O
"	O
Mozilla	B-Application
Firefox	I-Application
"	O
is	O
a	O
registered	O
trademark	O
of	O
Mozilla	B-Operating_System
;	O
along	O
with	O
the	O
official	O
Firefox	B-Application
logo	O
,	O
it	O
may	O
only	O
be	O
used	O
under	O
certain	O
terms	O
and	O
conditions	O
.	O
</s>
<s>
Anyone	O
may	O
redistribute	O
the	O
official	O
binaries	O
in	O
unmodified	O
form	O
and	O
use	O
the	O
Firefox	B-Application
name	O
and	O
branding	O
for	O
such	O
distribution	O
,	O
but	O
restrictions	O
are	O
placed	O
on	O
distributions	O
which	O
modify	O
the	O
underlying	O
source	O
code	O
.	O
</s>
<s>
The	O
name	O
"	O
Firefox	B-Application
"	O
derives	O
from	O
a	O
nickname	O
of	O
the	O
red	O
panda	O
.	O
</s>
<s>
Mozilla	B-Operating_System
has	O
placed	O
the	O
Firefox	B-Application
logo	O
files	O
under	O
open-source	O
licenses	O
,	O
but	O
its	O
trademark	O
guidelines	O
do	O
not	O
allow	O
displaying	O
altered	O
or	O
similar	O
logos	O
in	O
contexts	O
where	O
trademark	O
law	O
applies	O
.	O
</s>
<s>
There	O
has	O
been	O
some	O
controversy	O
over	O
the	B-Operating_System
Mozilla	I-Operating_System
Foundation	I-Operating_System
's	O
intentions	O
in	O
stopping	O
certain	O
open-source	O
distributions	O
from	O
using	O
the	O
"	O
Firefox	B-Application
"	O
trademark	O
.	O
</s>
<s>
Open-source	O
browsers	B-Application
"	O
enable	O
greater	O
choice	O
and	O
innovation	O
in	O
the	O
market	O
rather	O
than	O
aiming	O
for	O
mass-market	O
domination.	O
"	O
</s>
<s>
Mozilla	B-Operating_System
Foundation	I-Operating_System
Chairperson	O
Mitchell	O
Baker	O
explained	O
in	O
an	O
interview	O
in	O
2007	O
that	O
distributions	O
could	O
freely	O
use	O
the	O
Firefox	B-Application
trademark	O
if	O
they	O
did	O
not	O
modify	O
source	O
code	O
,	O
and	O
that	O
the	B-Operating_System
Mozilla	I-Operating_System
Foundation	I-Operating_System
's	O
only	O
concern	O
was	O
with	O
users	O
getting	O
a	O
consistent	O
experience	O
when	O
they	O
used	O
"	O
Firefox	B-Application
"	O
.	O
</s>
<s>
To	O
allow	O
distributions	O
of	O
the	O
code	O
without	O
using	O
the	O
official	O
branding	O
,	O
the	O
Firefox	B-Application
build	B-Application
system	I-Application
contains	O
a	O
"	O
branding	O
switch	O
"	O
.	O
</s>
<s>
This	O
switch	O
,	O
often	O
used	O
for	O
alphas	B-Device
(	O
"	O
Auroras	O
"	O
)	O
of	O
future	O
Firefox	B-Application
versions	O
,	O
allows	O
the	O
code	O
to	O
be	O
compiled	B-Language
without	O
the	O
official	O
logo	O
and	O
name	O
and	O
can	O
allow	O
a	O
derivative	O
work	O
unencumbered	O
by	O
restrictions	O
on	O
the	O
Firefox	B-Application
trademark	O
to	O
be	O
produced	O
.	O
</s>
<s>
Distributing	O
modified	O
versions	O
of	O
Firefox	B-Application
under	O
the	O
"	O
Firefox	B-Application
"	O
name	O
required	O
explicit	O
approval	O
from	O
Mozilla	B-Operating_System
for	O
the	O
changes	O
made	O
to	O
the	O
underlying	O
code	O
,	O
and	O
required	O
the	O
use	O
of	O
all	O
of	O
the	O
official	O
branding	O
.	O
</s>
<s>
For	O
example	O
,	O
it	O
was	O
not	O
permissible	O
to	O
use	O
the	O
name	O
"	O
Firefox	B-Application
"	O
without	O
also	O
using	O
the	O
official	O
logo	O
.	O
</s>
<s>
When	O
the	O
Debian	O
project	O
decided	O
to	O
stop	O
using	O
the	O
official	O
Firefox	B-Application
logo	O
in	O
2006	O
(	O
because	O
Mozilla	B-Operating_System
's	O
copyright	O
restrictions	O
at	O
the	O
time	O
were	O
incompatible	O
with	O
Debian	B-License
's	I-License
guidelines	I-License
)	O
,	O
they	O
were	O
told	O
by	O
a	O
representative	O
of	O
the	B-Operating_System
Mozilla	I-Operating_System
Foundation	I-Operating_System
that	O
this	O
was	O
not	O
acceptable	O
and	O
was	O
asked	O
either	O
to	O
comply	O
with	O
the	O
published	O
trademark	O
guidelines	O
or	O
cease	O
using	O
the	O
"	O
Firefox	B-Application
"	O
name	O
in	O
their	O
distribution	O
.	O
</s>
<s>
Debian	O
switched	O
to	O
branding	O
their	O
modified	O
version	O
of	O
Firefox	B-Application
"	O
Iceweasel	B-Operating_System
"	O
(	O
but	O
in	O
2016	O
switched	O
back	O
to	O
Firefox	B-Application
)	O
,	O
along	O
with	O
other	O
Mozilla	B-Operating_System
software	O
.	O
</s>
<s>
GNU	B-Application
IceCat	I-Application
is	O
another	O
derived	O
version	O
of	O
Firefox	B-Application
distributed	O
by	O
the	B-Application
GNU	I-Application
Project	I-Application
,	O
which	O
maintains	O
its	O
separate	O
branding	O
.	O
</s>
<s>
The	O
Firefox	B-Application
icon	O
is	O
a	O
trademark	O
used	O
to	O
designate	O
the	O
official	O
Mozilla	B-Operating_System
build	O
of	O
the	O
Firefox	B-Application
software	O
and	O
builds	O
of	O
official	O
distribution	O
partners	O
.	O
</s>
<s>
For	O
this	O
reason	O
,	O
software	O
distributors	O
who	O
distribute	O
modified	O
versions	O
of	O
Firefox	B-Application
do	O
not	O
use	O
the	O
icon	O
.	O
</s>
<s>
Early	O
Firebird	B-Application
and	O
Phoenix	B-Application
releases	O
of	O
Firefox	B-Application
were	O
considered	O
to	O
have	O
reasonable	O
visual	O
designs	O
but	O
fell	O
short	O
when	O
compared	O
to	O
many	O
other	O
professional	O
software	O
packages	O
.	O
</s>
<s>
In	O
October	O
2003	O
,	O
professional	O
interface	O
designer	O
Steven	O
Garrity	O
authored	O
an	O
article	O
covering	O
everything	O
he	O
considered	O
to	O
be	O
wrong	O
with	O
Mozilla	B-Operating_System
's	O
visual	O
identity	O
.	O
</s>
<s>
Shortly	O
afterwards	O
,	O
the	B-Operating_System
Mozilla	I-Operating_System
Foundation	I-Operating_System
invited	O
Garrity	O
to	O
head	O
up	O
the	O
new	O
visual	O
identity	O
team	O
.	O
</s>
<s>
The	O
release	O
of	O
Firefox	B-Application
0.8	O
in	O
February	O
2004	O
saw	O
the	O
introduction	O
of	O
the	O
new	O
branding	O
efforts	O
.	O
</s>
<s>
Included	O
were	O
new	O
icon	O
designs	O
by	O
silverorange	O
,	O
a	O
group	O
of	O
web	O
developers	O
with	O
a	O
long-standing	O
relationship	O
with	O
Mozilla	B-Operating_System
.	O
</s>
<s>
The	O
final	O
renderings	O
are	O
by	O
Jon	O
Hicks	O
,	O
who	O
had	O
worked	O
on	O
Camino	B-Language
.	O
</s>
<s>
The	O
animal	O
shown	O
in	O
the	O
logo	O
is	O
a	O
stylized	O
fox	O
,	O
although	O
"	O
firefox	B-Application
"	O
is	O
usually	O
a	O
common	O
name	O
for	O
the	O
red	O
panda	O
.	O
</s>
<s>
In	O
June	O
2019	O
,	O
Mozilla	B-Operating_System
unveiled	O
a	O
revised	O
Firefox	B-Application
logo	O
,	O
which	O
was	O
officially	O
implemented	O
on	O
version	O
70	O
.	O
</s>
<s>
The	O
new	O
logo	O
is	O
part	O
of	O
an	O
effort	O
to	O
build	O
a	O
brand	O
system	O
around	O
Firefox	B-Application
and	O
its	O
complementary	O
apps	O
and	O
services	O
,	O
which	O
are	O
now	O
being	O
promoted	O
as	O
a	O
suite	O
under	O
the	O
Firefox	B-Application
brand	O
.	O
</s>
<s>
Firefox	B-Application
was	O
adopted	O
rapidly	O
,	O
with	O
100million	O
downloads	O
in	O
its	O
first	O
year	O
of	O
availability	O
.	O
</s>
<s>
Firefox	B-Application
continued	O
to	O
heavily	O
market	O
itself	O
by	O
releasing	O
a	O
marketing	O
portal	O
dubbed	O
"	O
Spread	O
Firefox	B-Application
"	O
(	O
SFX	O
)	O
on	O
September	O
12	O
,	O
2004	O
,	O
It	O
debuted	O
along	O
with	O
the	O
Firefox	B-Application
Preview	O
Release	O
,	O
creating	O
a	O
centralized	O
space	O
for	O
the	O
discussion	O
of	O
various	O
marketing	O
techniques	O
.	O
</s>
<s>
The	O
release	O
of	O
their	O
manifesto	B-Operating_System
stated	O
that	O
"	O
the	O
Mozilla	B-Operating_System
project	I-Operating_System
is	O
a	O
global	O
community	O
of	O
people	O
who	O
believe	O
that	O
openness	O
,	O
innovation	O
and	O
opportunity	O
are	O
key	O
to	O
the	O
continued	O
health	O
of	O
the	O
Internet.	O
"	O
</s>
<s>
A	O
two-page	O
ad	O
in	O
the	O
edition	O
of	O
December	O
16	O
of	O
The	O
New	O
York	O
Times	O
,	O
placed	O
by	O
Mozilla	B-Operating_System
Foundation	I-Operating_System
in	O
coordination	O
with	O
Spread	O
Firefox	B-Application
,	O
featured	O
the	O
names	O
of	O
the	O
thousands	O
of	O
people	O
worldwide	O
who	O
contributed	O
to	O
the	B-Operating_System
Mozilla	I-Operating_System
Foundation	I-Operating_System
's	O
fundraising	O
campaign	O
to	O
support	O
the	O
launch	O
of	O
the	O
Firefox	B-Application
1.0	O
web	B-Application
browser	I-Application
.	O
</s>
<s>
SFX	O
portal	O
enhanced	O
the	O
"	O
Get	O
Firefox	B-Application
"	O
button	O
program	O
,	O
giving	O
users	O
"	O
referrer	O
points	O
"	O
as	O
an	O
incentive	O
.	O
</s>
<s>
From	O
time	O
to	O
time	O
,	O
the	O
SFX	O
team	O
or	O
SFX	O
members	O
launch	O
marketing	O
events	O
organized	O
at	O
the	O
Spread	O
Firefox	B-Application
website	O
.	O
</s>
<s>
As	O
a	O
part	O
of	O
the	O
Spread	O
Firefox	B-Application
campaign	O
,	O
there	O
was	O
an	O
attempt	O
to	O
break	O
the	O
world	O
download	O
record	O
with	O
the	O
release	O
of	O
Firefox	B-Application
3	O
.	O
</s>
<s>
In	O
February	O
2011	O
,	O
Mozilla	B-Operating_System
announced	O
that	O
it	O
would	O
be	O
retiring	O
Spread	O
Firefox	B-Application
(	O
SFX	O
)	O
.	O
</s>
<s>
Three	O
months	O
later	O
,	O
in	O
May	O
2011	O
,	O
Mozilla	B-Operating_System
officially	O
closed	O
Spread	O
Firefox	B-Application
.	O
</s>
<s>
Mozilla	B-Operating_System
wrote	O
that	O
"	O
there	O
are	O
currently	O
plans	O
to	O
create	O
a	O
new	O
iteration	O
of	O
this	O
website	O
[	O
Spread	O
Firefox ]	O
at	O
a	O
later	O
date.	O
"	O
</s>
<s>
In	O
celebration	O
of	O
the	O
third	O
anniversary	O
of	O
the	O
founding	O
of	O
the	B-Operating_System
Mozilla	I-Operating_System
Foundation	I-Operating_System
,	O
the	O
"	O
World	O
Firefox	B-Application
Day	O
"	O
campaign	O
was	O
established	O
on	O
July	O
15	O
,	O
2006	O
,	O
and	O
ran	O
until	O
September	O
15	O
,	O
2006	O
.	O
</s>
<s>
Participants	O
registered	O
themselves	O
and	O
a	O
friend	O
on	O
the	O
website	O
for	O
nomination	O
to	O
have	O
their	O
names	O
displayed	O
on	O
the	O
Firefox	B-Application
Friends	O
Wall	O
,	O
a	O
digital	O
wall	O
that	O
was	O
displayed	O
at	O
the	O
headquarters	O
of	O
the	B-Operating_System
Mozilla	I-Operating_System
Foundation	I-Operating_System
.	O
</s>
<s>
The	O
Firefox	B-Application
community	O
has	O
also	O
engaged	O
in	O
the	O
promotion	O
of	O
their	O
web	B-Application
browser	I-Application
.	O
</s>
<s>
In	O
2006	O
,	O
some	O
of	O
Firefox	B-Application
's	O
contributors	O
from	O
Oregon	O
State	O
University	O
made	O
a	O
crop	O
circle	O
of	O
the	O
Firefox	B-Application
logo	O
in	O
an	O
oat	O
field	O
near	O
Amity	O
,	O
Oregon	O
,	O
near	O
the	O
intersection	O
of	O
Lafayette	O
Highway	O
and	O
Walnut	O
Hill	O
Road	O
.	O
</s>
<s>
After	O
Firefox	B-Application
reached	O
500million	O
downloads	O
on	O
February	O
21	O
,	O
2008	O
,	O
the	O
Firefox	B-Application
community	O
celebrated	O
by	O
visiting	O
Freerice	B-Application
to	O
earn	O
500million	O
grains	O
of	O
rice	O
.	O
</s>
<s>
Other	O
initiatives	O
included	O
Live	O
Chat	O
–	O
a	O
service	O
Mozilla	B-Operating_System
launched	O
in	O
2007	O
that	O
allowed	O
users	O
to	O
seek	O
technical	O
support	O
from	O
volunteers	O
.	O
</s>
<s>
To	O
promote	O
the	O
launch	O
of	O
Firefox	B-Application
Quantum	B-Application
in	O
November	O
2017	O
,	O
Mozilla	B-Operating_System
partnered	O
with	O
Reggie	O
Watts	O
to	O
produce	O
a	O
series	O
of	O
TV	O
ads	O
and	O
social	O
media	O
content	O
.	O
</s>
<s>
In	O
December	O
2005	O
,	O
Internet	O
Week	O
ran	O
an	O
article	O
in	O
which	O
many	O
readers	O
reported	O
high	O
memory	O
usage	O
in	O
Firefox	B-Application
1.5	O
.	O
</s>
<s>
Mozilla	B-Operating_System
developers	O
said	O
that	O
the	O
higher	O
memory	O
use	O
of	O
Firefox	B-Application
1.5	O
was	O
at	O
least	O
partially	O
due	O
to	O
the	O
new	O
fast	O
backwards-and-forwards	O
(	O
FastBack	O
)	O
feature	O
.	O
</s>
<s>
Other	O
known	O
causes	O
of	O
memory	O
problems	O
were	O
malfunctioning	O
extensions	B-Protocol
such	O
as	O
Google	B-Protocol
Toolbar	I-Protocol
and	O
some	O
older	O
versions	O
of	O
AdBlock	B-Operating_System
,	O
or	O
plug-ins	B-Application
,	O
such	O
as	O
older	O
versions	O
of	O
Adobe	O
Acrobat	O
Reader	O
.	O
</s>
<s>
When	O
PC	O
Magazine	O
in	O
2006	O
compared	O
memory	O
usage	O
of	O
Firefox	B-Application
2	O
,	O
Opera	B-Application
9	I-Application
,	O
and	O
Internet	B-Application
Explorer	I-Application
7	I-Application
,	O
they	O
found	O
that	O
Firefox	B-Application
used	O
approximately	O
as	O
much	O
memory	O
as	O
each	O
of	O
the	O
other	O
two	O
browsers	B-Application
.	O
</s>
<s>
In	O
2006	O
,	O
Softpedia	O
noted	O
that	O
Firefox	B-Application
1.5	O
took	O
longer	O
to	O
start	O
up	O
than	O
other	O
browsers	B-Application
,	O
which	O
was	O
confirmed	O
by	O
further	O
speed	O
tests	O
.	O
</s>
<s>
Internet	B-Application
Explorer	I-Application
6	O
launched	O
more	O
swiftly	O
than	O
Firefox	B-Application
1.5	O
on	O
Windows	B-Application
XP	I-Application
since	O
many	O
of	O
its	O
components	O
were	O
built	O
into	O
the	O
OS	O
and	O
loaded	O
during	O
system	O
startup	O
.	O
</s>
<s>
As	O
a	O
workaround	O
for	O
the	O
issue	O
,	O
a	O
preloader	O
application	O
was	O
created	O
that	O
loaded	O
components	O
of	O
Firefox	B-Application
on	O
startup	O
,	O
similar	O
to	O
Internet	B-Application
Explorer	I-Application
.	O
</s>
<s>
A	O
Windows	B-Application
Vista	I-Application
feature	O
called	O
SuperFetch	O
performs	O
a	O
similar	O
task	O
of	O
preloading	O
Firefox	B-Application
if	O
it	O
is	O
used	O
often	O
enough	O
.	O
</s>
<s>
Tests	O
performed	O
by	O
PC	O
World	O
and	O
Zimbra	O
in	O
2006	O
indicated	O
that	O
Firefox	B-Application
2	O
used	O
less	O
memory	O
than	O
Internet	B-Application
Explorer	I-Application
7	I-Application
.	O
</s>
<s>
Firefox	B-Application
3	O
used	O
less	O
memory	O
than	O
Internet	B-Application
Explorer	I-Application
7	I-Application
,	O
Opera	O
9.50	O
Beta	O
,	O
Safari	B-Application
3.1	O
Beta	O
,	O
and	O
Firefox	B-Application
2	O
in	O
tests	O
performed	O
by	O
Mozilla	B-Operating_System
,	O
CyberNet	O
,	O
and	O
The	O
Browser	B-Application
World	O
.	O
</s>
<s>
In	O
mid-2009	O
,	O
BetaNews	O
benchmarked	O
Firefox	B-Language
3.5	I-Language
and	O
declared	O
that	O
it	O
performed	O
"	O
nearly	O
ten	O
times	O
better	O
on	O
XP	B-Application
than	O
Microsoft	B-Application
Internet	I-Application
Explorer	I-Application
7	I-Application
"	O
.	O
</s>
<s>
In	O
January	O
2010	O
,	O
Lifehacker	O
compared	O
the	O
performance	O
of	O
Firefox	B-Language
3.5	I-Language
,	O
Firefox	B-Protocol
3.6	I-Protocol
,	O
Google	B-Application
Chrome	I-Application
4	I-Application
(	O
stable	O
and	O
Dev	O
versions	O
)	O
,	O
Safari	B-Application
4	O
,	O
and	O
Opera	B-Application
(	O
10.1	O
stable	O
and	O
10.5	O
pre-alpha	O
versions	O
)	O
.	O
</s>
<s>
Lifehacker	O
timed	O
how	O
long	O
browsers	B-Application
took	O
to	O
start	O
and	O
reach	O
a	O
page	O
(	O
both	O
right	O
after	O
boot-up	O
and	O
after	O
running	O
at	O
least	O
once	O
already	O
)	O
,	O
timed	O
how	O
long	O
browsers	B-Application
took	O
to	O
load	O
nine	O
tabs	O
at	O
once	O
,	O
tested	O
JavaScript	B-Language
speeds	O
using	O
Mozilla	B-Operating_System
's	O
Dromaeo	O
online	O
suite	O
(	O
which	O
implements	O
Apple	O
's	O
SunSpider	O
and	O
Google	O
's	O
V8	O
tests	O
)	O
and	O
measured	O
memory	O
usage	O
using	O
Windows	B-Device
7	I-Device
's	O
process	O
manager	O
.	O
</s>
<s>
They	O
concluded	O
that	O
Firefox	B-Language
3.5	I-Language
and	O
3.6	O
were	O
the	O
fifth	O
-	O
and	O
sixth-fastest	O
browsers	B-Application
,	O
respectively	O
,	O
on	O
startup	O
,	O
3.5	O
was	O
third	O
-	O
and	O
3.6	O
was	O
sixth-fastest	O
to	O
load	O
nine	O
tabs	O
at	O
once	O
,	O
3.5	O
was	O
sixth	O
-	O
and	O
3.6	O
was	O
fifth-fastest	O
on	O
the	O
JavaScript	B-Language
tests	O
.	O
</s>
<s>
They	O
also	O
concluded	O
that	O
Firefox	B-Protocol
3.6	I-Protocol
was	O
the	O
most	O
efficient	O
with	O
memory	O
usage	O
followed	O
by	O
Firefox	B-Language
3.5	I-Language
.	O
</s>
<s>
In	O
February	O
2012	O
,	O
Tom	O
's	O
Hardware	O
performance	O
tested	O
Chrome	B-Application
17	O
,	O
Firefox	B-Application
10	O
,	O
Internet	B-Application
Explorer	I-Application
9	I-Application
,	O
Opera	B-Application
11.61	O
,	O
and	O
Safari	B-Application
5.1.2	O
on	O
Windows	B-Device
7	I-Device
.	O
</s>
<s>
In	O
the	O
performance	O
category	O
they	O
tested	O
HTML5	B-Application
,	O
Java	B-Device
,	O
JavaScript	B-Language
,	O
DOM	B-General_Concept
,	O
CSS	B-Language
3	I-Language
,	O
Flash	B-Operating_System
,	O
Silverlight	B-Application
,	O
and	O
WebGL	B-Library
(	O
WebGL	B-Library
2	I-Library
is	O
current	O
as	O
of	O
version	O
51	O
;	O
and	O
Java	B-Device
and	O
Silverlight	B-Application
stop	O
working	O
as	O
of	O
version	O
52	O
)	O
—	O
they	O
also	O
tested	O
startup	O
time	O
and	O
page	O
load	O
time	O
.	O
</s>
<s>
The	O
performance	O
tests	O
showed	O
that	O
Firefox	B-Application
was	O
either	O
"	O
acceptable	O
"	O
or	O
"	O
strong	O
"	O
in	O
most	O
categories	O
,	O
winning	O
three	O
categories	O
(	O
HTML5	B-Application
,	O
HTML5	B-Application
hardware	B-General_Concept
acceleration	I-General_Concept
,	O
and	O
Java	B-Device
)	O
only	O
finishing	O
"	O
weak	O
"	O
in	O
CSS	B-Language
performance	O
.	O
</s>
<s>
In	O
this	O
category	O
,	O
it	O
determined	O
that	O
Firefox	B-Application
was	O
only	O
"	O
acceptable	O
"	O
at	O
performing	O
light	O
memory	O
usage	O
,	O
while	O
it	O
was	O
"	O
strong	O
"	O
at	O
performing	O
heavy	O
memory	O
usage	O
.	O
</s>
<s>
In	O
the	O
reliability	O
category	O
,	O
Firefox	B-Application
performed	O
a	O
"	O
strong	O
"	O
amount	O
of	O
proper	O
page	O
loads	O
.	O
</s>
<s>
In	O
the	O
final	O
category	O
,	O
conformance	O
,	O
it	O
was	O
determined	O
that	O
Firefox	B-Application
had	O
"	O
strong	O
"	O
conformance	O
for	O
JavaScript	B-Language
and	O
HTML5	B-Application
.	O
</s>
<s>
In	O
conclusion	O
,	O
Tom	O
's	O
Hardware	O
determined	O
that	O
Firefox	B-Application
was	O
the	O
best	O
browser	B-Application
for	O
Windows	B-Device
7	I-Device
OS	O
,	O
but	O
that	O
it	O
only	O
narrowly	O
beat	O
Google	B-Application
Chrome	I-Application
.	O
</s>
<s>
In	O
June	O
2013	O
,	O
Tom	O
's	O
Hardware	O
again	O
performance	O
tested	O
Firefox	B-Application
22	O
,	O
Chrome	B-Application
27	O
,	O
Opera	B-Application
12	O
,	O
and	O
Internet	B-Application
Explorer	I-Application
10	I-Application
.	O
</s>
<s>
They	O
found	O
that	O
Firefox	B-Application
slightly	O
edged	O
out	O
the	O
other	O
browsers	B-Application
in	O
their	O
"	O
performance	O
"	O
index	O
,	O
which	O
examined	O
wait	O
times	O
,	O
JavaScript	B-Language
execution	O
speed	O
,	O
HTML5/CSS3	O
rendering	O
,	O
and	O
hardware	B-General_Concept
acceleration	I-General_Concept
performance	O
.	O
</s>
<s>
Firefox	B-Application
also	O
scored	O
the	O
highest	O
on	O
the	O
"	O
non-performance	O
"	O
index	O
,	O
which	O
measured	O
memory	O
efficiency	O
,	O
reliability	O
,	O
security	O
,	O
and	O
standards	O
conformance	O
,	O
finishing	O
ahead	O
of	O
Chrome	B-Application
,	O
the	O
runner-up	O
.	O
</s>
<s>
Tom	O
's	O
Hardware	O
concluded	O
by	O
declaring	O
Firefox	B-Application
the	O
"	O
sound	O
"	O
winner	O
of	O
the	O
performance	O
benchmarks	O
.	O
</s>
<s>
In	O
January	O
2014	O
,	O
a	O
benchmark	O
testing	O
the	O
memory	O
usage	O
of	O
Firefox	B-Application
29	O
,	O
Google	B-Application
Chrome	I-Application
34	O
,	O
and	O
Internet	B-Application
Explorer	I-Application
11	I-Application
indicated	O
that	O
Firefox	B-Application
used	O
the	O
least	O
memory	O
when	O
a	O
substantial	O
number	O
of	O
tabs	O
were	O
open	O
.	O
</s>
<s>
In	O
benchmark	O
testing	O
in	O
early	O
2015	O
on	O
a	O
"	O
high-end	O
"	O
Windows	O
machine	O
,	O
comparing	O
Microsoft	B-Application
Edge	I-Application
,	O
Internet	B-Application
Explorer	I-Application
,	O
Firefox	B-Application
,	O
Chrome	B-Application
,	O
and	O
Opera	B-Application
,	O
Firefox	B-Application
achieved	O
the	O
highest	O
score	O
on	O
three	O
of	O
the	O
seven	O
tests	O
.	O
</s>
<s>
Four	O
different	O
JavaScript	B-Language
performance	O
tests	O
gave	O
conflicting	O
results	O
.	O
</s>
<s>
Firefox	B-Application
surpassed	O
all	O
other	O
browsers	B-Application
on	O
the	O
Peacekeeper	O
benchmark	O
but	O
was	O
behind	O
the	O
Microsoft	O
products	O
when	O
tested	O
with	O
SunSpider	O
.	O
</s>
<s>
Measured	O
with	O
Mozilla	B-Operating_System
's	O
Kraken	O
,	O
it	O
came	O
second	O
place	O
to	O
Chrome	B-Application
,	O
while	O
on	O
Google	O
's	O
Octane	O
challenge	O
it	O
took	O
third	O
behind	O
Chrome	B-Application
and	O
Opera	B-Application
.	O
</s>
<s>
Firefox	B-Application
took	O
the	O
lead	O
with	O
WebXPRT	O
,	O
which	O
runs	O
several	O
typical	O
HTML5	B-Application
and	O
JavaScript	B-Language
tasks	O
.	O
</s>
<s>
Firefox	B-Application
,	O
Chrome	B-Application
,	O
and	O
Opera	B-Application
all	O
achieved	O
the	O
highest	O
possible	O
score	O
on	O
the	O
Oort	O
Online	O
test	O
,	O
measuring	O
WebGL	B-Library
rendering	O
speed	O
(	O
WebGL	B-Library
2	I-Library
is	O
now	O
current	O
)	O
.	O
</s>
<s>
In	O
terms	O
of	O
HTML5	B-Application
compatibility	O
testing	O
,	O
Firefox	B-Application
was	O
ranked	O
in	O
the	O
middle	O
of	O
the	O
group	O
.	O
</s>
<s>
A	O
similar	O
set	O
of	O
benchmark	O
tests	O
in	O
2016	O
showed	O
Firefox	B-Application
's	O
JavaScript	B-Language
performance	O
on	O
Kraken	O
and	O
the	O
newer	O
Jetstream	O
tests	O
trailing	O
slightly	O
behind	O
all	O
other	O
tested	O
browsers	B-Application
except	O
Internet	B-Application
Explorer	I-Application
(	O
IE	O
)	O
,	O
which	O
performed	O
relatively	O
poorly	O
.	O
</s>
<s>
On	O
Octane	O
,	O
Firefox	B-Application
came	O
ahead	O
of	O
IE	O
and	O
Safari	B-Application
,	O
but	O
again	O
slightly	O
behind	O
the	O
rest	O
,	O
including	O
Vivaldi	B-Language
and	O
Microsoft	B-Application
Edge	I-Application
.	O
</s>
<s>
As	O
of	O
the	O
adoption	O
of	O
Firefox	B-Application
57	O
and	O
Mozilla	B-Operating_System
's	O
Quantum	B-Application
project	O
entering	O
production	O
browsers	B-Application
in	O
November	O
2017	O
,	O
Firefox	B-Application
was	O
tested	O
to	O
be	O
faster	O
than	O
Chrome	B-Application
in	O
independent	O
JavaScript	B-Language
tests	O
,	O
and	O
demonstrated	O
to	O
use	O
less	O
memory	O
with	O
many	O
browser	B-Application
tabs	O
opened	O
.	O
</s>
<s>
TechRadar	O
rated	O
it	O
as	O
the	O
fastest	O
web	B-Application
browser	I-Application
in	O
a	O
May	O
2019	O
report	O
.	O
</s>
<s>
Downloads	O
have	O
continued	O
at	O
an	O
increasing	O
rate	O
since	O
Firefox	B-Application
1.0	O
was	O
released	O
on	O
November	O
9	O
,	O
2004	O
,	O
and	O
Firefox	B-Application
had	O
already	O
been	O
downloaded	O
over	O
one	O
billion	O
times	O
.	O
</s>
<s>
In	O
July	O
2010	O
,	O
IBM	O
asked	O
all	O
employees	O
(	O
about	O
400,000	O
)	O
to	O
use	O
Firefox	B-Application
as	O
their	O
default	O
browser	B-Application
.	O
</s>
<s>
Firefox	B-Application
was	O
the	O
second-most	O
used	O
web	B-Application
browser	I-Application
until	O
November	O
2011	O
,	O
when	O
Google	B-Application
Chrome	I-Application
surpassed	O
it	O
.	O
</s>
<s>
According	O
to	O
Mozilla	B-Operating_System
,	O
Firefox	B-Application
has	O
more	O
than	O
450million	O
users	O
.	O
</s>
<s>
Up	O
to	O
early	O
2020	O
,	O
Firefox	B-Application
was	O
the	O
second-most	O
widely	O
used	O
desktop	B-Application
browser	B-Application
,	O
and	O
that	O
position	O
made	O
it	O
the	O
third-most	O
popular	O
with	O
3.82	O
%	O
of	O
worldwide	O
usage	B-Application
share	I-Application
of	I-Application
web	I-Application
browsers	I-Application
across	B-Application
all	I-Application
platforms	I-Application
.	O
</s>
<s>
According	O
to	O
the	O
Firefox	B-Application
Public	O
Data	O
report	O
by	O
Mozilla	B-Operating_System
,	O
the	O
active	O
monthly	O
count	O
of	O
Desktop	B-Application
clients	O
has	O
decreased	O
from	O
around	O
310million	O
in	O
2017	O
to	O
260million	O
in	O
2019	O
.	O
</s>
<s>
From	O
Oct	O
2020	O
,	O
the	O
desktop	B-Application
market	O
share	O
of	O
Firefox	B-Application
started	O
to	O
decline	O
in	O
countries	O
where	O
it	O
used	O
to	O
be	O
the	O
most	O
popular	O
.	O
</s>
<s>
In	O
addition	O
to	O
versions	O
of	O
Firefox	B-Application
made	O
internally	O
and	O
the	O
email	O
client	O
Mozilla	B-Application
Thunderbird	I-Application
,	O
there	O
are	O
several	O
third-party	O
web	B-Application
browsers	I-Application
based	O
on	O
Firefox	B-Application
,	O
including	O
:	O
</s>
