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Duplicate Tab Closer 1.0 Release.1.1-signed.1-signed Requires Restart
Closes duplicate and empty tabs. Uses control+shift+d as the keyboard shortcut to do it.
About this Add-on
It adds a button on the addon toolbar (the tool tip for the button says "Close blank and duplicate tabs"), which when pressed, closes duplicate and blank tabs.
It also adds the keyboard shortcut Ctrl+Shift+d (note Mac users, it is Ctrl not Cmd) to perform the same operation (d stands for delete duplicates and blank tabs).