Handy extension that can be used to save common words and phrases you use often for easy typing.
Have you noticed that everybody looks the titles of your open tabs? It has a name: Paranoia! And a solution too: TabRenamizer!
Edit textareas using an external editor, because it's all text!
Right click on a textarea, select "It's All Text!" and edit the text in the editor of your choice.
Alternatively, click on the edit buttons added for your convenience. Right click on ...
Displays the current SSL/TLS cipher, protocol and certificate chain in the Add-on bar and Site ID dialog
Note from Mozilla: This add-on has been discontinued. Try Roomy Bookmarks Toolbar instead.
An extension that allows for the use of dynamic commands in Firefox.
Generates magnet links for torrent sites, letting you pull the torrent out of the swarm without downloading it from the website
Tab grouping, vertical tab tree, multi-rows, and various tweaks for power users.