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GNU IceCat

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GNU IceCat
GNUzilla is the GNU version of the Mozilla suite, and GNU IceCat is the GNU version of the Firefox browser.

The GNU Project keeps IceCat in synchronization with upstream development of Firefox ESR (Extended Support Release, the security and stability focused version) with scripts. The goal of the IceCat project is to provide a completely free version of the popular mozilla source code. It is part of Gnuzilla, the umbrella project analogous to Mozilla. While the source code from the Mozilla project is free software, the binaries that they release include additional non-free software. Firefox add-on repository ( consist of both free and non-free software (Mozilla develop some of them). IceCat uses Trisquel web browser repository that only allow free software. IceCat does keep the triple licensing used by Firefox to facilitate the reuse of code.

IceCat also includes some privacy protection features:

  1. Some sites refer to zero-size images on other hosts to keep track of cookies. When IceCat detects this mechanism it blocks cookies from the site hosting the zero-length image file. (It is possible to re-enable such a site by removing it from the blocked hosts list.)
  2. Other sites rewrite the host name in links redirecting the user to another site, mainly to "spy" on clicks. When this behavior is detected, IceCat shows a message alerting the user.

"IRC irc:// " IRC general channel

Heckert gnu.small.png This is a GNU package:gnuzilla


Download version 31.5.0 (stable)
released on 9 March 2015

VCS Checkout


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This package is listed in the following Collections:


LicenseVerified byVerified onNotes
GPLv2orlaterKelly Hopkins14 September 2010
LGPLv2.1orlaterKelly Hopkins14 September 2010
MPL1.1Kelly Hopkins14 September 2010

Leaders and contributors

Rubén Rodríguez Maintainer

Resources and communication

Audience Resource type URI
Bug Tracking Mailing List Info/Archive
Developer VCS Repository Webview

Software prerequisites

This entry (in part or in whole) was last reviewed on 26 March 2015.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.

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