<s>
Firefox	B-Operating_System
Focus	I-Operating_System
is	O
a	O
free	B-License
and	I-License
open-source	I-License
privacy-focused	O
mobile	B-Application
browser	I-Application
based	O
on	O
Firefox	B-Application
from	O
Mozilla	B-Operating_System
,	O
available	O
for	O
Android	B-Application
and	O
iOS	B-Application
smartphones	O
and	O
tablets	O
.	O
</s>
<s>
Firefox	B-Operating_System
Focus	I-Operating_System
was	O
initially	O
a	O
tracker-blocking	O
application	B-Application
for	O
mobile	O
iOS	B-Application
devices	O
,	O
released	O
in	O
December	O
2015	O
.	O
</s>
<s>
It	O
was	O
developed	O
into	O
a	O
minimalistic	O
web	B-Application
browser	I-Application
shortly	O
afterwards	O
.	O
</s>
<s>
However	O
,	O
it	O
can	O
still	O
work	O
solely	O
as	O
a	O
tracking-blocker	O
in	O
the	O
background	O
of	O
the	O
Safari	B-Application
browser	I-Application
on	O
Apple	O
devices	O
.	O
</s>
<s>
In	O
June	O
2017	O
,	O
the	O
first	O
release	O
for	O
Android	B-Application
went	O
public	O
and	O
was	O
downloaded	O
over	O
one	O
million	O
times	O
in	O
the	O
first	O
month	O
.	O
</s>
<s>
Since	O
July	O
2018	O
,	O
Firefox	B-Operating_System
Focus	I-Operating_System
is	O
preinstalled	O
on	O
the	O
BlackBerry	B-Application
Key2	I-Application
as	O
part	O
of	O
the	O
application	B-Application
Locker	O
.	O
</s>
<s>
To	O
bypass	O
content-blocker	O
restrictions	O
from	O
Apple	O
,	O
Firefox	B-Operating_System
Focus	I-Operating_System
uses	O
the	O
UIWebView	O
API	B-General_Concept
on	O
iOS	B-Application
devices	O
.	O
</s>
<s>
On	O
Android	B-Application
,	O
it	O
used	O
the	O
Blink	B-Language
engine	O
in	O
version	O
6.x	O
and	O
earlier	O
,	O
and	O
it	O
has	O
used	O
GeckoView	B-Language
since	O
version	O
7.0	O
.	O
</s>
<s>
Firefox	B-Operating_System
Focus	I-Operating_System
is	O
designed	O
to	O
block	O
online	B-Application
trackers	I-Application
,	O
including	O
third-party	O
advertising	O
,	O
with	O
the	O
end	O
goal	O
of	O
both	O
improving	O
browsing	O
speed	O
and	O
protecting	O
users	O
 '	O
privacy	O
.	O
</s>
<s>
Content	O
blocking	O
is	O
achieved	O
using	O
the	O
Disconnect	B-Operating_System
block	O
lists	O
.	O
</s>
<s>
In	O
the	O
other	O
Firefox	B-Application
browsers	I-Application
,	O
users	O
have	O
to	O
enable	O
the	O
tracking	O
protection	O
feature	O
inside	O
the	O
browser	B-Application
preferences	O
manually	O
.	O
</s>
<s>
On	O
December	O
20	O
,	O
2018	O
,	O
Mozilla	B-Operating_System
announced	O
that	O
Firefox	B-Operating_System
Focus	I-Operating_System
now	O
checks	O
all	O
URLs	O
against	O
the	O
Google	B-Application
Safe	I-Application
Browsing	I-Application
service	O
to	O
help	O
prevent	O
people	O
from	O
accessing	O
fraudulent	O
sites	O
.	O
</s>
<s>
Firefox	B-Operating_System
Focus	I-Operating_System
can	O
be	O
set	O
as	O
content-blocker	O
in	O
the	O
Safari	B-Application
web	I-Application
browser	I-Application
options	O
.	O
</s>
<s>
After	O
activating	O
the	O
Safari	B-Application
integration	O
in	O
the	O
Firefox	B-Operating_System
Focus	I-Operating_System
settings	O
,	O
it	O
will	O
disable	O
trackers	O
automatically	O
in	O
the	O
background	O
when	O
browsing	O
using	O
the	O
Safari	B-Application
browser	I-Application
.	O
</s>
<s>
Firefox	B-Operating_System
Focus	I-Operating_System
contains	O
a	O
option	O
called	O
telemetry	O
.	O
</s>
<s>
By	O
activating	O
it	O
,	O
users	O
can	O
allow	O
Mozilla	B-Operating_System
to	O
collect	O
and	O
receive	O
non	O
personal-identifiable	O
information	O
to	O
improve	O
Firefox	B-Application
.	O
</s>
<s>
Due	O
to	O
privacy	O
concerns	O
,	O
telemetry	O
of	O
Firefox	B-Application
Klar	O
is	O
disabled	O
by	O
default	O
.	O
</s>
<s>
October	O
15	O
,	O
2018	O
,	O
Mozilla	B-Operating_System
announced	O
that	O
Firefox	B-Operating_System
Focus	I-Operating_System
is	O
being	O
updated	O
with	O
a	O
new	O
search	O
feature	O
and	O
visual	O
design	O
.	O
</s>
<s>
That	O
means	O
the	O
browser	B-Application
will	O
conceptually	O
tell	O
users	O
about	O
its	O
features	O
and	O
options	O
.	O
</s>
<s>
The	O
mechanism	O
needs	O
hardware	O
that	O
can	O
handle	O
the	O
extra	O
load	O
of	O
content	O
blocking	O
so	O
it	O
only	O
works	O
on	O
64-bit	O
devices	O
running	O
iOS	B-Operating_System
9	I-Operating_System
and	O
above	O
including	O
:	O
</s>
<s>
,	O
iOS	B-Application
11.4	O
or	O
above	O
is	O
required	O
to	O
download	O
Firefox	B-Operating_System
Focus	I-Operating_System
on	O
the	O
App	B-Application
Store	I-Application
.	O
</s>
<s>
Android	B-Application
version	O
5.0	O
or	O
higher	O
is	O
required	O
to	O
use	O
the	O
latest	O
version	O
of	O
Firefox	B-Operating_System
Focus	I-Operating_System
.	O
</s>
<s>
"	O
Firefox	B-Application
Klar	O
"	O
is	O
the	O
modified	O
version	O
with	O
telemetry	O
disabled	O
released	O
for	O
German-speaking	O
countries	O
in	O
order	O
to	O
avoid	O
the	O
ambiguity	O
with	O
the	O
German	O
news	O
magazine	O
FOCUS	O
.	O
</s>
