Firefox Environment Backup Extension
Session Manager
Smart Bookmarks Bar
IE Tab Plus
External Application Buttons mod
Rehost Image
Gmail Manager
google tool bar
IE Tab 2
Add to Search Bar
Easy DragToGo
Greasemonkey Gmail Air Skin 2 Background Blue-Green 1
Save images
Profile Manager and Synchronizer
Mr. Tech toolkit google docs Firefox Sync
Firefox install
Firefox Portable
7: Disable extension install delay

One of the few gripes I have with Firefox is the silly countdown you must endure every time you want to install an extension. Fortunately, this can be disabled. Search for enable_delay and you should see:

security.dialog_enable_delay: Change this to 0.
8: View source code in an external editor

When you need to view the source of a page, it opens up in browser popup. Most developers would probably like to have that opened in their favorite editor instead of having to cut and paset. To do this, there are two entries to modify. Search for view_source.editor and you will see:

view_source.editor.external: Change this to true.

view_source.editor.path: Change this to the explicit path to your editor of choice.
28 Firefox 3 About:Config 

view_source.editor.external   view_source.editor.path 


browser.tabs.tabMinWidth   Firefox-scrollingtab change to 0