GNU IceCat: the truly free browser based on Firefox

  • GNU IceCat is a Firefox-based browser developed by the GNU project.
  • It focuses on privacy and security by removing non-free elements from Firefox.
  • Includes tools like LibreJS and JShelter to mitigate privacy issues.
  • Available for GNU/Linux, Windows, Android and macOS through GNU Guix.
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GNI IceCat

The Internet is dominated by browsers that, to a greater or lesser extent, collect user data or integrate proprietary software. For those looking for a truly free alternative, GNU IceCat emerged as a standout choice. This browser, developed by the GNU project, is a version of Mozilla Firefox that removes any trace of non-free software and adds security and privacy improvements.

If you've ever wondered what sets it apart from other browsers or why the free software community prefers it, in this article We break down all its features, advantages and how you can install it on your system.

What is GNU IceCat?

GNU IceCat, formerly known as IceWeasel, is a web browser based on Mozilla Firefox but with one key difference: It is completely free softwareIt is distributed through the GNU project and is part of GNUzilla, the application suite based on Mozilla products.

This browser maintains the same basic functionalities of Firefox, but remove any non-open source components. It also incorporates additional measures for improve privacy and security of the user. This philosophy is also found in other projects such as GNU.

Main features of GNU IceCat

  • Completely free software: Unlike Firefox, IceCat does not recommend proprietary add-ons or plugins.
  • Greater privacy: Includes tools such as GNU LibreJS to block non-free JavaScript and prevent tracking.
  • Fingerprint Protection: Implements measures to prevent sites from tracking your browser through fingerprinting.
  • Safety notices: Block suspicious redirects and tracking cookies.
  • Integration with GNU Guix: It can be easily installed on GNU/Linux systems using the Guix package manager.

Differences with Mozilla Firefox

Although IceCat It is based on Firefox, its philosophy and functions make it very different. Some of its main differences include:

  • Absence of non-free software: Does not allow non-open source plugins or extensions.
  • Greater privacy control: Take advanced measures to minimize web tracking.
  • Default optimized configuration: While in Firefox the user must manually modify settings to improve privacy, in IceCat this is already configured.

Advanced security features

GNU IceCat has been configured with a focus on security. Among its improvements, it includes:

  • Tracker Blocking: Use lists to avoid invasive scripts.
  • LibreJS: Blocks non-free JavaScript that could compromise privacy.
  • Fingerprint protection: Modifies values ​​in API so that sites cannot uniquely identify the browser.
  • Redirect Notices: Notifies when a page attempts to redirect to another page without user permission.

If you are interested in improving your browsing experience beyond GNU IceCat, you can explore Floorp, a Firefox-based browser that stands out for its customization.

How to install GNU IceCat

The browser does not have official binary versions, so its installation varies depending on the operating system. For GNU/Linux, the easiest option is to use GNU GuideOn other systems, it is necessary to compile the source code.

Installation in GNU/Linux with Guix

If you have GNU Guix on your system, simply run:

guix install icecat

This will download and configure the latest available version automatically.

Manual compilation

For systems without access to Guix, the source code can be downloaded from GNUzilla and compile it following the instructions in the repository. Newer versions also they are offered in portable version.

If you prefer browsing alternatives, you might consider options like basilisk.

History and evolution of GNU IceCat

The browser was born in 2005 under the name GNU IceWeasel. Its initial goal was to provide a version of Firefox without proprietary dependencies., as Mozilla implemented trademark restrictions that prevented the browser from being modified and redistributed under its original identity.

In 2007, the name changed to IceCat to avoid confusion with the Debian modified version of Firefox, who independently adopted the name IceWeasel.

Over the years, IceCat has integrated Multiple security improvements, adapting to Firefox's Extended Support Release (ESR) versions to maintain stability in its code base. These updates are in line with the trend of other free software projects seeking to protect user privacy.

Who develops IceCat?

The browser is currently maintained by the team at GNUzilla, with contributions from the free software community. Its development is a voluntary effort, so anyone interested can participate through mailing lists and its IRC on Libera.Chat.

Availability and compatibility

GNU IceCat is available for:

  • Linux: It works natively.
  • Windows: It can be installed manually.
  • macOS: Available for versions 10.14 onwards.
  • Android: There is a mobile version on F-Droid.

While not as well known as other browsers, IceCat represents one of the best options for those looking for a browsing experience that respects their privacy. privacy and maintain an absolute commitment to the FOSS.

Mozilla Terms of Use
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