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clicks is available in Ubuntu. [?]
PwdHash extension for Firefox
per-site password generator for Mozilla browsers
Torbutton extension for Firefox
firefox extension enabling 1-click toggle of Tor usage
Mozgest extension for Mozilla suite
Mouse gestures add-on for Mozilla suite
Diggler extension for Firefox
A set of URL manipulation utilities for Seamonkey and Firefox's location bar
Nukeimage context menu for Firefox
Mozilla context menu option to remove image from display
bidiui extension for Thunderbird/Icedove
BiDirectional support for Thunderbird
Venkman extension for Firefox
Javascript debugger for Mozilla based applications
User Agent Switcher extension for Firefox
user agent switcher extension for the Firefox web browser
Scrapbook extension for Firefox
Firefox extension to save and manage Web pages
Sage extension for Firefox
Lightweight RSS and Atom feed reader for Firefox
Quickfile extension for Thunderbird/Icedove
faster mail filing for the Thunderbird mail client
Biofox extension for Firefox
extension of bioinformatics tools for the Firefox and Seamonkey browsers
Enigmail extension for Thunderbird
Enigmail - GPG support for Thunderbird
Firefox Showcase extension for Firefox/Iceweasel
Showcase provides a new way to manage your Firefox tabs and windows.
Beagle extension for Firefox
Beagle extension for Firefox
LiveHTTPHeaders extension for Firefox
Adds information about the HTTP headers to Firefox and SeaMonkey
Context Menu extensions for Firefox
Context Menu Extensions for Firefox
Stumbleupon extension for Firefox
Mozilla addon for sharing interesting websites
Imagezoom extension for Mozilla suite
Mozilla context menu option to zoom current image
Firebug extension for Firefox
web development plugin for Firefox