Extensions by Weekly Downloads
Googlepedia Requires Restart
Shows you a relevant Wikipedia article along with your search results. Clicking links in the article will trigger new Google searches, making it a very useful research tool...
MyIP Requires Restart
MyIP is a useful extension that shows your IP address in the status bar.
DiggiDig Requires Restart
Quick URL manipulation
Open a different path, subdomain or protocol based on the current URL.
Empty the location-bar by clicking on the icon.
FFXI Helper Requires Restart
The only FFXI extension you'll ever need!
SmugManager Requires Restart
Quickly Access SmugMug Management...
Radio Eksen Requires Restart
Radio Eksen ticker
vnDict - Vietnamese Dictionaries Requires Restart
Vietnamese dictionaries extension for firefox. ...
FireStox Requires Restart
A stock monitor with advanced features like line and pie charts
Orkut Scrapbook Searcher Requires Restart
This adds a search box inside the orkut page for searching through scrapbooks,communities. The box is context sensitive and automatically changes between searching scrapbook,community threads and community thread messages...
Online Music Player Requires Restart
OMusic, the Online-Music-Player.
It is a music player in status-bar. It provides firefox with ability to play online mp3 music(local file as well), to search and display the lyrics automatically, as well as to manage the music lists.
gTalk Sidebar Requires Restart
Don't have time to install Gtalk? Want a simple solution? Then try using gTalk from your sidebar!
Word Count Plus Requires Restart
Counts number of words in selected text. Can add the count to a running total.
Suricate Requires Restart
Collaborative parental control
Esperanto Toolbar Requires Restart
Esperantistaj butonoj kaj serĉo.
Search and buttons for Esperanto.
Lexmark Toolbar Requires Restart
The Lexmark Toolbar improves Web printing by removing unwanted stuff, saving you ink and paper.
del.icio.us IncSearch Requires Restart
Router Status Requires Restart
Shows the current status of your local network and devices/routers in the tool or status bar.
Internet Explorer Shortcuts Requires Restart
Ctrl+E = Web Search
Ctrl+F3 = View Source
Note that Ctrl+E does not work in Firefox 4, because Ctrl+E is the new Expose Tabs feature.