Komodo Edit is a fast and free multi-language code editor. Written in JS, Python, C++ and based on the Mozilla platform.

Catalog of classic Firefox add-ons created before WebExtensions apocalypse

The greatest user script engine on the Internet (a fork of Greasemonkey).

Lightweight C++ GUI Library 轻量级C++图形界面库

[WIP] A curated list and XPI files of Mozilla Firefox browser extensions, addons, themes from addons.mozilla.org, before XUL-based purge blackout

A legacy Mozilla Firefox add-on to import and export search engines from XML files in the OpenSearch format

This is a Thunderbird addon that adds some magic to the folder list columns. Check the addon website for more info...

Thunderbird add-on CompactHeader

A Firefox Extension to add support for the Universal Edit Button

NoSquint is a Firefox add-on that allows you to adjust the text-only and full-page zoom levels as well as color settings both globally (for all sites) and per site.

A PC Music Disk, 9 electro & hip/hop tracks with a 3D interface.

Easier management of the user interface language in Mozilla applications

Mirror of mailredirect extension

Google summer of code project - Dialog development area for CONVERT XUL TO REACT.

live XUL editor : with seamonkey open this --->

Pale Moon Release Branch Clone

This is a Thunderbird addon that lets you customize the IMAP quota statusbar panel.

XUL fork of uBlock Origin for Advanced users

A continuation of legacy XUL version of DownThemAll! ✔️preserves web.archive.org timestamps, ✔️advanced filters for remote directory tree mirroring, ✔️UI is tweaked for better UX

UXP - Unified XUL Platform