Close Other Tabs от constructor, Michał Kopeć

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/