MozdevIncubator

The mozdev.org site has served as an incubator for many different prominent features, extensions, applications and ideas in the Mozilla community. Here is a list of some of the projects that started on mozdev.org that have since matured and moved to other places or that laid the groundwork for future product features:

Project Description More Information
Camino Originally called Chimera, Camino is a popular Gecko based Web browser for OS X http://caminobrowser.org/
Greasemonkey An extension that allows users to install scripts that make on-the-fly changes to most HTML-based web pages http://www.greasespot.net/
Aphrodite An early attempt to create a browser-only application based on the Mozilla Suite code that predates the Firefox effort
Total Recall A precursor for the Session Restore feature built into Firefox http://support.mozilla.com/kb/Session+Restore
JSLib Javascript library of common useful routines for extension developers. This was an early version of the idea behind FUEL and STEEL.
Multizilla Led the way for Tabbed Browsing, which changed the way we work in the browser http://multizilla.mozdev.org/mozilla.html
Adblock Plus Popular ad blocking extension http://adblockplus.org/
Forumzilla Feed reader that is now part of Thunderbird More information
Sage A lightweight RSS and Atom feed reader extension for Mozilla Firefox. This is a recommended Add-on at AMO and winner of the Most Innovative Upgraded Extension award in the Extend Firefox contest N/A
Optimoz Bringing Mouse Gestures to Mozilla software since, er, a long time! http://www.mousegestures.org/