<s>
GNU	B-Application
IceCat	I-Application
,	O
formerly	O
known	O
as	O
GNU	B-Application
IceWeasel	I-Application
,	O
is	O
a	O
completely	O
free	B-Application
version	O
of	O
the	O
Mozilla	B-Application
Firefox	I-Application
web	B-Application
browser	I-Application
distributed	O
by	O
the	B-Application
GNU	I-Application
Project	I-Application
.	O
</s>
<s>
It	O
is	O
compatible	O
with	O
Linux	B-Application
,	O
Windows	O
,	O
Android	B-Application
and	O
macOS	B-Application
.	O
</s>
<s>
IceCat	O
is	O
released	O
as	O
a	O
part	O
of	O
GNUzilla	B-Application
,	O
GNU	O
's	O
rebranding	O
of	O
a	O
code	O
base	O
that	O
used	O
to	O
be	O
the	O
Mozilla	B-Language
Application	I-Language
Suite	I-Language
.	O
</s>
<s>
As	O
an	O
internet	B-Protocol
suite	I-Protocol
,	O
GNUzilla	B-Application
also	O
includes	O
a	O
mail	O
and	O
newsgroup	O
program	O
,	O
and	O
an	O
HTML	O
composer	O
.	O
</s>
<s>
Mozilla	O
produces	O
free	B-License
and	I-License
open-source	I-License
software	I-License
,	O
but	O
the	O
binaries	O
include	O
trademarked	O
artwork	O
.	O
</s>
<s>
The	B-Application
GNU	I-Application
Project	I-Application
attempts	O
to	O
keep	O
IceCat	O
in	O
synchronization	O
with	O
upstream	O
development	O
of	O
Firefox	B-Application
(	O
long-term	O
support	O
versions	O
)	O
while	O
removing	O
all	O
trademarked	O
artwork	O
and	O
non-free	B-Application
add-ons	B-Operating_System
.	O
</s>
<s>
It	O
also	O
maintains	O
a	O
large	O
list	O
of	O
free	B-Application
software	I-Application
plugins	B-Application
.	O
</s>
<s>
In	O
addition	O
,	O
it	O
includes	O
several	O
security	O
and	O
privacy	O
features	O
not	O
found	O
in	O
the	O
mainline	O
Firefox	B-Application
browser	I-Application
.	O
</s>
<s>
The	O
Mozilla	O
Corporation	O
holds	O
the	O
trademark	O
to	O
the	O
Firefox	B-Application
name	O
and	O
denies	O
the	O
use	O
of	O
the	O
name	O
"	O
Firefox	B-Application
"	O
to	O
unofficial	O
builds	O
that	O
fall	O
outside	O
certain	O
guidelines	O
.	O
</s>
<s>
Unless	O
distributions	O
use	O
the	O
binary	O
files	O
supplied	O
by	O
Mozilla	O
,	O
fall	O
within	O
the	O
stated	O
guidelines	O
,	O
or	O
else	O
have	O
special	O
permission	O
,	O
they	O
must	O
compile	B-Language
the	O
Firefox	B-Application
source	O
with	O
a	O
compile-time	O
option	O
enabled	O
that	O
creates	O
binaries	O
without	O
the	O
official	O
branding	O
of	O
Firefox	B-Application
and	O
related	O
artwork	O
,	O
using	O
either	O
the	O
built-in	O
free	B-Application
artwork	O
,	O
or	O
artwork	O
provided	O
at	O
compile	B-Language
time	O
.	O
</s>
<s>
During	O
this	O
debate	O
,	O
the	O
name	O
"	O
Iceweasel	O
"	O
was	O
coined	O
to	O
refer	O
to	O
rebranded	O
versions	O
of	O
Firefox	B-Application
.	O
</s>
<s>
It	O
was	O
intended	O
as	O
a	O
parody	O
of	O
"	O
Firefox	B-Application
"	O
.	O
</s>
<s>
Iceweasel	O
was	O
subsequently	O
used	O
as	O
the	O
example	O
name	O
for	O
a	O
rebranded	O
Firefox	B-Application
in	O
the	O
Mozilla	O
Trademark	O
Policy	O
,	O
and	O
became	O
the	O
most	O
commonly	O
used	O
name	O
for	O
a	O
hypothetical	O
rebranded	O
version	O
of	O
Firefox	B-Application
.	O
</s>
<s>
In	O
August	O
2005	O
,	O
the	O
GNUzilla	B-Application
project	O
adopted	O
the	O
GNU	B-Application
IceWeasel	I-Application
name	O
for	O
a	O
rebranded	O
distribution	O
of	O
Firefox	B-Application
that	O
made	O
no	O
references	O
to	O
nonfree	O
plugins	B-Application
.	O
</s>
<s>
The	O
term	O
"	O
ice	B-Application
weasel	I-Application
"	O
appeared	O
earlier	O
in	O
a	O
line	O
which	O
cartoonist	O
Matt	O
Groening	O
fictionally	O
attributed	O
to	O
Friedrich	O
Nietzsche	O
:	O
"	O
Love	O
is	O
a	O
snowmobile	O
racing	O
across	O
the	O
tundra	O
and	O
then	O
suddenly	O
it	O
flips	O
over	O
,	O
pinning	O
you	O
underneath	O
.	O
</s>
<s>
At	O
night	O
,	O
the	O
ice	B-Application
weasels	I-Application
come.	O
"	O
</s>
<s>
Debian	O
was	O
originally	O
given	O
permission	O
to	O
use	O
the	O
trademarks	O
,	O
and	O
adopted	O
the	O
Firefox	B-Application
name	O
.	O
</s>
<s>
However	O
,	O
because	O
the	O
artwork	O
in	O
Firefox	B-Application
had	O
a	O
proprietary	B-Application
copyright	O
license	O
at	O
the	O
time	O
,	O
which	O
was	O
not	O
compatible	O
with	O
the	O
Debian	B-License
Free	I-License
Software	I-License
Guidelines	I-License
,	O
the	O
substituted	O
logo	O
had	O
to	O
remain	O
.	O
</s>
<s>
In	O
2006	O
,	O
Mozilla	O
withdrew	O
their	O
permission	O
for	O
Debian	O
to	O
use	O
the	O
Firefox	B-Application
name	O
due	O
to	O
significant	O
changes	O
to	O
the	O
browser	B-Application
that	O
Mozilla	O
deemed	O
outside	O
the	O
boundaries	O
of	O
its	O
policy	O
,	O
changes	O
which	O
Debian	O
felt	O
were	O
important	O
enough	O
to	O
keep	O
,	O
and	O
Debian	O
revived	O
the	O
Iceweasel	O
name	O
in	O
its	O
place	O
.	O
</s>
<s>
Subsequently	O
,	O
on	O
23	O
September	O
2007	O
,	O
one	O
of	O
the	O
developers	O
of	O
the	O
GNU	B-Application
IceWeasel	I-Application
package	O
announced	O
that	O
the	O
name	O
would	O
be	O
changed	O
to	O
GNU	B-Application
IceCat	I-Application
from	O
IceWeasel	O
in	O
the	O
next	O
release	O
,	O
so	O
as	O
to	O
avoid	O
confusion	O
with	O
Debian	O
's	O
separately	O
maintained	O
,	O
unrelated	O
rebranding	O
of	O
Firefox	B-Application
.	O
</s>
<s>
IceCat	O
was	O
ported	O
to	O
the	O
Firefox	B-Application
3	O
codebase	O
during	O
Google	B-Application
Summer	I-Application
of	I-Application
Code	I-Application
of	O
2008	O
.	O
</s>
<s>
GNU	B-Application
IceCat	I-Application
is	O
freely	O
downloadable	O
for	O
the	O
IA-32	B-Device
,	O
x86	B-Device
64	I-Device
,	O
and	O
PowerPC	B-Architecture
architectures	O
.	O
</s>
<s>
Both	O
binaries	O
and	O
source	O
are	O
available	O
,	O
though	O
the	O
current	O
build	O
is	O
available	O
only	O
for	O
Linux	B-Application
.	O
</s>
<s>
Some	O
distributions	O
offer	O
binary	O
and	O
source	O
packages	O
through	O
their	O
repositories	O
,	O
such	O
as	O
Trisquel	B-Application
,	O
Parabola	O
GNU/Linux	B-Application
-libre	O
and	O
Fedora	O
.	O
</s>
<s>
IceCat	O
is	O
also	O
available	O
for	O
macOS	B-Application
10.4	O
and	O
higher	O
.	O
</s>
<s>
Any	O
Mac	O
user	O
with	O
these	O
versions	O
of	O
macOS	B-Application
can	O
install	O
IceCat	O
through	O
Fink	B-Application
.	O
</s>
<s>
For	O
the	O
Mac	O
,	O
it	O
is	O
available	O
for	O
both	O
IA-32	B-Device
and	O
PowerPC	B-Architecture
architectures	O
.	O
</s>
<s>
Unofficial	O
builds	O
are	O
available	O
for	O
Windows	O
(	O
Vista	O
or	O
newer	O
)	O
and	O
Android	B-Application
(	O
2.3	O
or	O
newer	O
)	O
.	O
</s>
<s>
IceCat	O
includes	O
additional	O
security	O
features	O
,	O
such	O
as	O
the	O
option	O
to	O
block	O
third	O
party	O
zero-length	O
image	O
files	O
resulting	O
in	O
third-party	O
cookies	O
,	O
also	O
known	O
as	O
web	B-Protocol
bugs	I-Protocol
(	O
This	O
feature	O
is	O
available	O
in	O
Firefox	B-Application
1.0	O
,	O
1.5	O
,	O
and	O
3.0	O
,	O
but	O
the	O
UI	O
option	O
was	O
absent	O
on	O
2.0	O
)	O
.	O
</s>
<s>
GNU	B-Application
IceCat	I-Application
also	O
provides	O
warnings	O
for	O
URL	O
redirection	O
.	O
</s>
<s>
In	O
version	O
3.0.2-g1	O
,	O
the	O
certificate	O
of	O
a	O
certificate	B-Architecture
authority	I-Architecture
CAcert.org	O
has	O
been	O
added	O
to	O
the	O
list	O
of	O
trusted	O
root	B-Protocol
certificates	I-Protocol
.	O
</s>
<s>
The	O
GNU	B-Operating_System
LibreJS	I-Operating_System
extension	O
detects	O
and	O
blocks	O
non-free	B-Application
non-trivial	O
JavaScript	B-Language
.	O
</s>
<s>
Gnuzilla	B-Application
is	O
available	O
under	O
the	O
MPL/GPL/LGPL	O
tri-license	O
that	O
Mozilla	O
used	O
for	O
source	O
code	O
.	O
</s>
