GNU IceCat

GNU IceCat
GNU IceCat
	GNU IceCat new-tab page
Developer(s)	GNUzilla team, GNU Project
Stable release	115.21.0 / 5 March 2025
Repository	git.savannah.gnu.org/cgit/gnuzilla.git ;
Engine	Gecko;
Operating system	Linux; Windows; macOS; Android;
Type	Web browser
License	MPL-2.0 (source files from Mozilla Firefox browser); GPL-3.0-or-later (Scripts to convert Firefox into IceCat);
Website	www.gnu.org/software/gnuzilla/

GNU IceCat, formerly known as GNU IceWeasel, is a completely free version of the Mozilla Firefox web browser distributed by the GNU Project. It is compatible with Linux, Windows, Android and macOS.

IceCat is released as a part of GNUzilla, GNU's rebranding of a code base that used to be the Mozilla Application Suite. As an internet suite, GNUzilla also includes a mail and newsgroup program, and an HTML composer.

Mozilla produces free and open-source software, but the binaries include trademarked artwork. The GNU Project attempts to keep IceCat in synchronization with upstream development of Firefox ESR (long-term support versions) while removing all trademarked artwork and non-free add-ons. It also maintains a large list of free software plugins. In addition, it includes several security and privacy features not found in the mainline Firefox browser.