Status bar widgets and progress indicators for Firefox 4+
The greatest user script engine on the Internet (a fork of Greasemonkey).
This 15KB restartless add-on will add a "File" -> "Restart" menu item and a ctrl/cmd + alt + r hotkey to restart Firefox or Seamonkey.
The Add-ons Manager slims down!
This add-on reduces the height of entries in the Add-on Manager, so you can display more of them at a time.
Add RSS icon back into location bar (URL) in Firefox 4.0. This icon was showed in Firefox 3.5/3.6 by default when page offered feeds.
Stratiform is the ultimate user friendly customization add-on for Firefox. It puts the power in the average user's hands to customize the browser's look.
Bring back your personal and powerful Firefox Button!
Move Firefox Button to anywhere you want, and make it also available in Full Screen mode, or when Menu Bar is showing.
Anti-Aliasing Tuner for Direct2D/DirectWrite Text Rendering
Adds icons to your Firefox menus. Choose from the built-in icon sets or import your own.