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"Note that About:Startup, while technically a restartless add-on, will not be able to display information from before it was installed. In other words, you have to have it installed before Firefox starts to get information from it.

While we're on the subject of restarting, Restartless Restart adds a menu button and keyboard hot key combination to allow you to restart the browser. It currently lacks a toolbar icon, yet the core function, on-the-fly restarting, is effective and smooth.

LuckyBar restores the 'I'm Feeling Lucky' functionality to Firefox 4. The feature was present in Firefox 3, but removed because of Mozilla's concerns over privacy issues relating to accidentally sending search queries to your default search engine instead of restricting the search to your personal Firefox data.


Tab Badge provides an unread count for sites like Twitter and Facebook, as well as your RSS feed and webmail.

(Credit: Mozilla)"

Source : Google Reader