Mozilla Update:Directory of available extensions with user reviews.
Aphrodite: An alternative user interface for Mozilla.
ChatZilla: An IRC chat client built using the Mozilla framework.
Checky 2.2: The Checky plug-in for Mozilla, Firefox and Netscape allows for web content and resource developers to easily access free and commercial online validator services.
Extension Room: Available extensions for Mozilla. Also available are Firefox and Thunderbird extensions.
Googlebar L10N: Localized Google toolbar for Mozilla users.
IE Ctrl+Enter for Mozilla: Add Internet Explorer-like behaviour for the Ctrl+Enter combination.
Jeremy's Mozilla Extensions: Enhancement extensions created by Jeremy Gillick.
mozCalc: Localized desktop calculator application allowing input in both "standard" and reverse polish notation.
NewsMonster: A news, weblog, and RSS aggregator that runs directly in your Mozilla web browser.
One Click Dynamic Sidebar: A dynamic sidebar for Mozilla apps that include many programs in one sidebar.
Outliner: Allows organizion of notes into a tree.
RankQuest SEO Toolbar: Provides quick access to more than 25 SEO tools.
ReloadEvery: Automatically reloads a web page every so many seconds or minutes.