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(Re)add a context menu to tabs menus that closes other tabs of the selected tab.

The "Close Other Tabs" was removed from the regular location and put in a submenu in Firefox version 78. This extension re-adds that menu item back to a more convenient location. Not yet tested with Tree Style Tabs.

See also other siblings of this extension:
https://addons.mozilla.org/en-US/firefox/addon/close-tabs-right/
https://addons.mozilla.org/en-US/firefox/addon/close-tabs-left/