この拡張機能について

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://cup.aihedy.com/en-US/firefox/addon/close-tabs-right/
https://cup.aihedy.com/en-US/firefox/addon/close-tabs-left/

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1.0.4 のリリースノート

Fix typo left from debugging in RU locale

Previously in 1.0.3: Fix context menu disappearing in non-English locale
https://github.com/constructor-s/close-other-tabs/pull/2#issuecomment-694748073