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Oxford Dictionaries
Search Oxford Dictionaries Online for English word definitions.
Tab Counter
A simple extension that counts the number of open tabs per window and displays the count in the toolbar...
Open Multiple Locations Requires Restart
Adds a "File" menu option to open multiple locations at a time.
RequestPolicy v0.5 Legacy Requires Restart
Be in control of which cross-site requests are allowed. Improve the privacy of your browsing by not letting other sites know your browsing habits. Secure yourself from Cross-Site Request Forgery (CSRF) and other attacks.
Greek - English (US) Spelling dictionary
Combined Greek - English (US) spell checking dictionary for Firefox - Thunderbird - Seamonkey
Zindus Requires Restart
Google and Zimbra contact sync for Thunderbird. (TB 24 and above NOT supported)
ConQuery Requires Restart
Context searching for everyone and URL manipulation tool for advanced users...
DOM Inspector Plus! [dm] Requires Restart
Improved DOM Inspector! [dm version]. Box Model new layout & more data, see screenshot!. Horizontal scroll for Dom-Tree, and some more.
Inspects the structure and properties of a window and its contents.
WEB.DE Search
With WEB.DE Search you safely and quickly find what you are searching for.
wmlbrowser Requires Restart
Simulate WAP browsing by viewing WML (Wireless Markup Language) pages.
TryAgain Requires Restart
TryAgain keeps trying to load a webpage when the server cannot be reached.
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.
Disconnect Search (address bar)
Search the web in private through Disconnect's search proxy (search.disconnect.me) right from your search bar!
Note: This extention is no longer actively maintained.
To create your own collections, you must have a Mozilla Add-ons account.