Install
clicks is available in Ubuntu. [?]
Ubufox extension for Firefox
Ubuntu Firefox specific configuration defaults and apt support
Adblock Plus extension for Firefox
advertisement blocking extension for web browsers
Lightning extension for Thunderbird
Calendar Extension for Thunderbird/Icedove
Enigmail extension for Thunderbird
Enigmail - GPG support for Thunderbird
Flashblock extension for Firefox
mozilla extension that replaces flash elements with a button
Firefox Launchpad plugin
Launchpad firefox integration
Web Developer toolbar for Firefox
web developer extension for the Firefox web browser
Imagezoom extension for Mozilla suite
Mozilla context menu option to zoom current image
Greasemonkey extension for Firefox
dummy transitional package for firefox-greasemonkey -> greasemonkey
Ubuntu-it menu extension for Firefox
Firefox extension for a quick browse of Ubuntu-it community
No Script extension for Firefox
Javascript/plugins permissions manager for Iceweasel and Iceape
Beagle extension for Firefox
Beagle extension for Firefox
Firebug extension for Firefox
web development plugin for Firefox
Quickfile extension for Thunderbird/Icedove
faster mail filing for the Thunderbird mail client
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
All in one Sidebar extension for Firefox
A sidebar extension for Mozilla Firefox
Sage extension for Firefox
Lightweight RSS and Atom feed reader for Firefox
Firefox Showcase extension for Firefox/Iceweasel
Showcase provides a new way to manage your Firefox tabs and windows.