GNUzilla and IceCat
Introducing GNUzilla and IceCat
GNUzilla is the GNU version of the Mozilla suite, and GNU IceCat is
the GNU version of the Firefox browser. Its main advantage is an
ethical one: it is entirely free software.
While the Firefox source code from the Mozilla project is free
software, they distribute and recommend non-free software as
plug-ins and addons. Also their trademark license restricts distribution
in several ways incompatible with freedom 0.
Privacy protection features
Extension that encrypts your communications with many major websites,
making your browsing more secure.
Blocks privacy trackers while in normal browsing mode, and all third party
requests when in private browsing mode. Based on Adblock Plus.
Adds a custom "about:icecat" homepage with links to information about the
free software and privacy features in IceCat, and checkboxes to enable
and disable the ones more prone to break websites.
- Fingerprinting countermeasures:
Fingerprinting is a series of techniques allowing to uniquely identify a
browser based on specific characterisics of that particular instance (like
what fonts are available in that machine). Unlike cookies the user cannot
opt-out of being tracked this way, so the browser has to avoid giving away
that kind of hints.
Official releases of IceCat are available from ftp.gnu.org, or any GNU mirror. Please use a mirror if possible.
Besides the sources, binary releases for GNU/Linux (32 and 64 bit) are available.
IceCat is generated from Firefox with the scripts available at http://git.savannah.gnu.org/cgit/gnuzilla.git.
Free add-ons and plugins
We maintain a list of free addons.
GNUzilla runs its own plugin finder service at gnuzilla.gnu.org.
You can find langpacks for IceCat in the official GNU FTP: ftp://ftp.gnu.org/gnu/gnuzilla/ in the "langpacks" directory for a given release
These langpacks are generated automatically from the original Firefox
ones, if you notice problems in your locale, please let us know at
Online help and documentation
Community driven manuals are available at http://libreplanet.org/wiki/Group:IceCat/
General discussion of these projects take place on the mailing list
email@example.com (it's not
just for bug reports, despite the name). Feel free to subscribe or browse the
To subscribe to the GNU IceCat mailing list, either use the mailman web
interface or send empty email with a Subject: header line of just
subscribe to firstname.lastname@example.org.
Found a bug? Have a suggestion? Please report it to the mailing
list, trying to specify all the information that could be involved
(platform, program version (the command icecat --version
will report this), and build tools version if building from source
code). Please report both the behavior you expected to the actual
behavior you observed.
Development of IceCat,
and GNU in general, is a volunteer effort, and you can contribute. For
information, please read How to help GNU. If you'd
like to get involved, it's a good idea to join the discussion mailing
list (see above).
- GNU IceCat is currently being maintained by Ruben Rodriguez.
Please use the mailing lists for contact.
Origin of the name
The name “IceCat” was coined to show our relationship to
the Mozilla Firefox browser. Ice isn't Fire and a Cat isn't a Fox, so
it is clearly a different package (we don't want Mozilla blamed for our
mistakes, nor cause confusion with their trademarks), but is equally
clearly intimately related (of course nearly all of the work comes from
the Mozilla foundation effort, so we want to give credit).
The gNewSense BurningDog browser and the Debian IceWeasel browser are
similarly derived from Firefox, also with the intent of being free
software. Technically, however, these projects are maintained entirely
independently of IceCat. (Previously, this GNU browser project was also
named IceWeasel, but that proved confusing.)
About GNU and the GNU Philosophy
The GNU Project was launched in 1984 to develop a
complete Unix-like operating system which is free software—free as in freedom, not price. Its
principal sponsor is the Free Software
The free software
philosophy is the root and motivation of the guidelines and goals of
the whole free software movement, a worldwide community.
Please join us!
Please send FSF & GNU inquiries to
There are also other ways to contact
Please send broken links and other corrections or suggestions to
Copyright 2012,2014 Free Software Foundation, Inc.
This page is licensed under a Creative
Commons Attribution-NoDerivs 3.0 United States License.
We thank the Hitflip
team for the IceCat logos.
$Date: 2014/10/21 14:55:34 $