Her Bert's Library tagged extension →  View Popular, Search in Google

The Contacts add-on integrates with local and web-based address books to bring all of a user’s contact data into a single database.

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Facebook Filter lets you control which posts appear on your Facebook News Feed. It can automatically hide “is now friends with”, “became a fan of”, “joined a group”, “was tagged in an album”, events, and all applications except those you exclude.

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Quicktext is an extension for Thunderbird that lets you create templates that can be easily inserted into your own emails. Using Thunderbird

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Just make a text document with the the extension .xml in the Program Files/Mozilla Firefox/searchplugins directory and paste the following lines of code and replace the highlighted parts (Shortname, Description, yourdomain.com) with your details.

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Screengrab! is an extension for Firefox that makes it easy to save a web-page as an image.

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Die Technologie von Surf Canyon kann als Zusatz fuer Suchmaschinen ebenso wie als eigenstaendige Suchmaschine eingesetzt werden.

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