Internet Archive Search - Firefox Addon - Search add-on for Archive.org. Internet Archive: Universal Access To All Knowledge.
Internet Archive is a non-profit library that was founded to provide permanent universal access to all knowledge. To accomplish this, the Archive actively collects, creates and provides access to archives of digital media
Reopen last closed tab - This extension allows you to reopen the last closed tab, one only. The way to reopen tab is to hold for at least 1.5 seconds the "new tab" button pressed; when the tab has appeared, you can go away from the button
7Live7 Bookmarks - Firefox Addon - Use 7Live7.com Bookmarks to store and search public and private Bookmarks. Enjoy the ability of distinguishing your Bookmark from others by making it bold for one priority point. We have on the url a referral code to indicate the hits coming from the Add-On
Facebook Search without logging in! Search Facebook Messages, People, Applications, Video, Music, Groups etc. For more it allows one to search for specific texts on the walls of Facebook subscribers en masse