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/

Install

• License: Mozilla Public License 2.0
• Weekly downloads: 9
• Average daily users: 858
• Rating: 4.9688/5 of 32 ratings
• Created: 2020-07-03 03:18:37
• Last updated: 2020-09-18 12:45:21
• Homepage: https://github.com/mkopec/close-tabs-to-the-right
• Support site and email
• Orig: https://addons.mozilla.org/en-US/firefox/addon/close-other-tabs-menu/
• API: {a02f4411-7950-4b43-abcd-23a01a9ce719}