Keyboard shortcut in the browser to close other tabs, what is it?

Question

Mozilla Firefox

How in a browser (for example, in Mozilla Firefox) to execute the command "Close tabs on the right" or "Close other tabs" using a keyboard shortcut?
There are no standard keyboard shortcuts. Can you somehow assign these combinations? Is there a browser extension?

Answer 1

Chromium-based vivaldi browser has a huge amount of keyboard shortcut settings

Screen for commands above tabs

Answer 2

I will partially answer my own question myself:
https://addons.mozilla.org/en-US/firefox/addon/clo...
https://addons.mozilla.org/en-US/firefox/addon/clo..
These are extensions that add "Close tabs on the right" and "Close other tabs" buttons .