Welcome back to There is only XUL dot org – XULvolution in all its forms.

This site is intended to be a low-bias cross-project/community resource.

XUL Applications (Grouped by "mozilla" codebase variant)

Please keep in mind that mentions of Gecko versions in describing a specific variant is for reference of where (the current incarnation) came from not where it currently is nor where it will progress to.

Evolved Gecko/56

SeaMonkey Internet Application Suite by The SeaMonkey Project
Previously made popular by Netscape and Mozilla, the SeaMonkey project continues to develop and deliver high-quality updates to this concept. Containing an Internet browser, email & newsgroup client with an included web feed reader, HTML editor, IRC chat and web development tools, SeaMonkey is sure to appeal to advanced users, web developers and corporate users.

Aura Runtime Environment (Alternatively evolved Gecko/52)

Interlink Mail & News by Binary Outcast
The classical e-mail, newsgroup, and rss client originally based on Thunderbird 52. Yes, we admit that now.

Unified XUL Platform (Evolved Gecko/52)

Pale Moon by Moonchild Productions
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.

Epyrus by Athenian200
The idealized e-mail client and companion to Pale Moon.

Basilisk Browser by Basilisk-dev
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.

IceWeasel-UXP by The Hyperbola Project
Libre-fork of Basilisk (Firefox 52).

IceDove-UXP by The Hyperbola Project
Libre-fork of Thunderbird 52.

IceApe-UXP by The Hyperbola Project
Libre-fork of SeaMonkey 2.49.

RT's Free Soft UXP Builds by Roytam1 (and MSFN Community Contributors)
Unified XUL Platform Applications modified to work on Windows XP and other legacy Microsoft Operating Systems.

Tycho (Evolved Gecko/38)

Arctic Fox Web Browser by Riccardo
Arctic Fox aims to be a desktop oriented browser with phone support removed, or no longer updated in the tree.
The goal here is to implement specific security updates and bug fixes to keep this browser as up to date as possible for aging systems. Examples would be Mac OSX 10.6-10.8, PowerPC's running Linux, Windows XP, etc.