Disable Add-on Compatibility Checks - Firefox Addon - While it used to be possible to disable add-on compatibility checking entirely, by setting the extensions.checkCompatibility preference to false, it is now necessary to set a different preference for each new application version. This add-on re-enables the functionality of extensions
GuifiProxy - Firefox Addon - Simple proxy manager for Firefox.
· Change proxy with two clicks.
· Import and export proxies lists using files.
· Import proxies from URL.
· Manually add, delete and edit proxies.
· Automatic authentication on proxies (bypass popup with login and password)
Nightly Tester Tools for Mobile - This extension adds a few extras useful to those who regularly test nightly builds of Mobile Firefox (i.e. "Fennec").
· Quit Fennec (when only one last is open)
· Send build id to Pastebin.com
· Send list of extensions to Pastebin.com
· Send contents of about:support to Pastebin
HootBar - (formerly known as TwitterBar) is a social media publishing tool that allows you to post messages to Twitter directly from your Firefox 4 address bar
Test Pilot - Firefox Addon - Test Pilot is privacy sensitive user research program run by Mozilla Labs. As a Test Pilot, you'll be joining a global community helping us to improve Mozilla products, both existing ones like Firefox and those that are still in development
Restartless Restart - This very tiny (12KB) add-on will add a "Restart" menu item to the "File" menu, optional toolbar button, and a ctrl/cmd + alt + r hotkey to Firefox, Seamonkey, and Thunderbird which will restart the program
Low Quality Flash - This Firefox add-on uses JavaScript to alter OBJECT and EMBED tags on a page setting Adobe Flash objects to "Low Quality." This can vastly improve performance. It also helps if there's a site you love to read that just so happens to load 20 flash advertisements next to the article text.
This is not supported or endorsed by Adobe in any way
BetterGaia - Firefox Addon - BetterGaia changes the way you work with Gaia Online. You can now chat, shop, and interact better than before with BetterGaia with improved site navigation, design, and more