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Duplicate Tab Blocker
Prevent duplicate tabs. Allow only one tab for a url. If you click a link that is already opened in a tab, then existing tab would be focused instead of opening a new tab. This works even across firefox windows.
Metal Lion Image Saver
Requires Restart
Single-click access to common actions for images (e.g. saving, copying, printing)
Lightweight Themes Preview for SeaMonkey
Preview lightweight theme when hover on menuitems in Apply Theme menu.
Share to Google+ Page
Requires Restart
Share to your Google+ Profile or Google+ Page with just click of a button.
Словарь синонимовъ RU
Requires Restart
Adds to browser Russian(RU) synonyms dictionary from package LibreOffice.
To create your own collections, you must have a Mozilla Add-ons account.