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ConQuery Requires Restart
Context searching for everyone and URL manipulation tool for advanced users...
Youtube Downloader Gold
This extension to download audio and video from popular video hosting YouTube. To download the available formats mp4, webm, mp4a, mp3.
ALLYouTubeDownloader Requires Restart
ALLYouTubeDownloader extention (FLV/MP4/WebM; HD/HQ). Windows only. Works only with ALL YouTube Downloader 2.3 application or higher (versions 2.2 and lower doesn't work anymore).
Homepage: http://www.allplayer.org/youtube-to-allplayer
Webmaster SAPE Requires Restart
Toolbar contains a set of functions, which expands the abilities of webmasters and optimizers, when working in the interface of SAPE exchange.
Video Pinner
Pins a YouTube video to the page so that it is always visible while you scroll and read comments. Port of Chrome's Video Pinner extension
Zindus Requires Restart
Google and Zimbra contact sync for Thunderbird. (TB 24 and above NOT supported)
Gmail Manager Requires Restart
The original Gmail notifier for multiple accounts. Allows you to receive new mail notifications along with viewing account details including unread messages, saved drafts, spam messages, labels with new mail, space used, and new mail snippets.
Gfire WebGame Detection Plugin Requires Restart
This extension tells Xfire and Gfire about the webgame you currently play.
Orkut Toolbar Requires Restart
Orkut Toolbar helps you to format the text of your posts in the Orkut forums, easily access all common functions of orkut, create and manage custom signatures and insert and view images and flash movies in orkut posts and scraps.
To create your own collections, you must have a Mozilla Add-ons account.