Pale Moon offers you a browsing experience in a browser completely built from its own, independently developed source that has been forked off from Firefox/Mozilla code a number of years ago, with carefully selected features and optimizations to improve the browser's stability and user experience, while offering full customization and a growing collection of extensions and themes to make the browser truly your own.
Basilisk is a free and Open Source XUL-based web browser, featuring the well-known Firefox-style interface and operation. It is based on the Goanna layout and rendering engine (a fork of Gecko) and builds on the Unified XUL Platform (UXP), which in turn is a fork of the Mozilla code base without Servo or Rust.
Ambassador is a fork of the ChatZilla IRC client built upon the Unified XUL Platform. It features a simple, straighforward interface with a number of options for customization and extensibility. It is available as an add-on compatible with other applications built upon UXP, and as a stand-alone package that can be installed and run independently of a browser.
A Windows/Linux MailNews client focusing on Mail (POP/IMAP), RSS Feeds, and Newsgroups.
Iceweasel-UXP is a web browser forked from Basilisk. Originally a fork of Firefox 52 inspired by Debian branding, the Hyperbola Project needed an application that would continue to support XUL extensions. The application seeks to maintain long-term stability while having removed support for Rust, WebExt, Telemetry, DRM and other anti-features from the browser.
Icedove-UXP is a mail application with RSS and calendar support built on the Unified XUL Platform. Originally inspired by Debian branding, and forked from Thunderbird 52's XUL layout, this application seeks to maintain a stable mail client while removing support for anti-features and SaaSS.
A very traditional web navigator based on the browser component from SeaMonkey