GNU IceCat Alternatives

Firefox is a free and open source web browser developed by Mozilla Foundation and the community. Roughly 250 million people use Firefox to browse the web daily. The browser is loved by many and in the open-source world it's seen as the defacto web browser. Firefox is highly extensible, and provides an ecosystem for thousands of third-party add-ons, that can be used to extend the capability of the software. According to tests the Firefox outperform similar web browsers like Google Chrome and Safari. The Firefox project also takes deep pride in preserving user privacy in a world where more and more personal data is collected.

A free and open-source web browser based on Goanna. Pale Moon is designed and developed with an emphasis on customizability, hence their motto "Your browser, Your way". The browser is available for Linux and Windows and is a for of Firefox with substantial divergence to make it as customizable as possible.

Kiwi Browser is a Andrioid-based web browser made to browse the internet, read news, watch videos and listen to music, without annoyances. Kiwi offers a bunch of customization options, allowing you to move the address bar to the bottom, add a hand button to reach the top of the screen, swipe from the edge to navigate in the browser, and see a simplified view for web pages, among others.

Bromite is a free and open-source web browser for Android. The application is a fork of Chromium and supports ad blocking and provides enhanced privacy. The main goal of  the Bromite project is to provide a clutter-free browsing experience without privacy-invasive features and with the addition of a fast ad-blocking engine. Minimal UI changes are applied to help curbing the idea of "browser as an advertisement platform".

A free and open-source web browser developed specifically for x64, ARM64, and PPC64LE systems. Waterfox is fully customizable and allows users to modify and extend the browser any way the please with WebExtensions and classic-style bootstrap add-ons. The browser also respects your privacy, with no built-in telemetry or data collections (beside version number, for automatic updates). Waterfox is available for all major computer operating systems like macOS, Linux and Windows, and a mobile version for Android.