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Configuration Mania
A Firefox extension provides a interface for tweaking its advanced (hidden) settings.
Conkeror is a Mozilla-based browser that brings an emacs-like experience to web browsing. It has a sophisticated keyboard system for running commands and interacting with web page content, modelled after Emacs and Lynx. For easier editing of form fields, it can spawn external editors. It is self-documenting and extensible with JavaScript. Conkeror is fully-customizable and highly-extensible, but is based on Mozilla XULRunner, which Mozilla has stopped supporting development in July 2015. N.B. Not to be confused with Konqueror.
IceCat Heckert gnu.small.png
For WebExtensions, see FSD:IceCat WebExtensions (proposed)#Approved GNU IceCat (originally GNU IceWeasel) is part of GNUzilla (the GNU version of the Mozilla Application Suite). GNU IceCat aim to be based on the the current official release of Firefox Extended Support Release (ESR) with removal of trademarked artwork and proprietary components. However, IceCat is not a straight fork of Firefox ESR; instead, it is a parallel effort that works closely with and re-bases in synchronization on the latest Firefox ESR as the upstream supplier, with patches merged upstream whenever possible; although it should be noted that additional security updates are customized to IceCat occasionally.

Differences between IceCat and Firefox ESR

Important differences between Mozilla's Firefox and GNU IceCat is that IceCat has a focus on freedom and privacy.

  • EME is not implemented: Whereas Firefox are being created such that they support Digital Restrictions Management (DRM) systems through their implementation of the Encrypted Media Extension (EME), GNU IceCat doesn't include an EME implementation as it opposes efforts to popularize and ease the dissemination of DRM technology.
  • IceCat is configured with WebRTC disabled.

Inbuilt add-ons

Unlike Firefox ESR, IceCat comes pre-installed with add-ons. They are:


GNU IceCat was formerly known as GNU IceWeasel but changed its name in 2008 to avoid confusion with Debian IceWeasel (who was rebranded back to Firefox in 2017)ref.

See also

IceCatMobile Heckert gnu.small.png
Please read the IceCat page for full description about this browser. This page specifically lists IceCatMobile compatible add-ons in addition, Copy Profile do not exist for the desktop version for example. Add-ons from this AMO collection have been applied here. The F-droid download page is also provided. As usual IceCatMobile comes with SpyBlock, a modified variant of Adblock Plus. IceCatMobile is more free software liberal than Adblock Browser, a fork of Firefox for Android with Adblock Plus installed (see

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.