Some serve same basic purpose, but only use one at a time. Uncertain which I prefer or haven't found better ones. Divided into Currently Installed, Uninstalled or Disabled, & Interesting Add-ons.
Expands the context menu's 'Search for' item into a list of installed search engines, allowing you to choose the engine you want to use for each search.
Personalize Firefox Button in Firefox 4 and change it to your personal and powerful one!
Create your personalized menu to replace Menu Bar in Firefox 3.
A simple extension that counts the number of open tabs per window and displays the count in the toolbar...
This extension will automatically close old windows and tabs so you don't wind up with zillions of old windows open at the same time. NEW FEATURES IN 3.0. Password protection....and 3 modes of operation.
Change location of Status Bar Icons, Firefox Menu Button and Menu Bar and more.
Double-click action for Firefox -
double-click Link, Bookmark/History to open in new tab (emulate ctrl+click).
Take control of your tabs! Purposely lightweight extension with the following features...
Add Unsorted Bookmarks Folder to Bookmarks Menu
The only way to create and access secure bookmarks while private browsing.
Quickly get movie-related information, like casts, ratings, plots, bios, and much more