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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.
To create your own collections, you must have a Mozilla Add-ons account.