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clicks is available in Ubuntu. [?]
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
Biofox extension for Firefox
extension of bioinformatics tools for the Firefox and Seamonkey browsers
Speed Dial extension for Firefox
Speed Dial for fast access to your most visited websites.
Diggler extension for Firefox
A set of URL manipulation utilities for Seamonkey and Firefox's location bar
Torbutton extension for Firefox
firefox extension enabling 1-click toggle of Tor usage
Nukeimage context menu for Firefox
Mozilla context menu option to remove image from display
Scrapbook extension for Firefox
Firefox extension to save and manage Web pages
bidiui extension for Thunderbird/Icedove
BiDirectional support for Thunderbird
Foxyproxy extension for Firefox
advanced proxy management tool for Firefox
Mozgest extension for Mozilla suite
Mouse gestures add-on for Mozilla suite
PwdHash extension for Firefox
per-site password generator for Mozilla browsers