2023/02/19
HI. i have checked. It still works normally, both the mirror and rotate buttons.
Or do you mean the shortcut doesn't work? maybe some addon use the same shortcuts
How to Manage extension shortcuts >>> https://support.mozilla.org/en-US/kb/manage-extension-shortcuts-firefox

if it's still not work. Can you try disabling all addons to just this one? If it works, it means some of your addons are in conflict with this one.

If it works then please reply me. I want to know which addon it is so I can check and fix it.