xul topic
ca-archive
Catalog of classic Firefox add-ons created before WebExtensions apocalypse
KomodoEdit
Komodo Edit is a fast and free multi-language code editor. Written in JS, Python, C++ and based on the Mozilla platform.
scriptish
The greatest user script engine on the Internet (a fork of Greasemonkey).
LongUI
Lightweight C++ GUI Library 轻量级C++图形界面库
xseei
A legacy Mozilla Firefox add-on to import and export search engines from XML files in the OpenSearch format
Firefox-52-ESR-legacy-addon
[WIP] A curated list and XPI files of Mozilla Firefox browser extensions, addons, themes from addons.mozilla.org, before XUL-based purge blackout
compactheader
Thunderbird add-on CompactHeader
ColumnsWizard
This is a Thunderbird addon that adds some magic to the folder list columns. Check the addon website for more info...
ThunderStats
This addon adds awesome statistics to your beloved Thunderbird!