This didn't work for me at all (FF Developer Ed. v109). I tried disabling Ctrl+I and Ctrl+B ("italic" and "bold" editing commands) so FF wouldn't intercept them for Page Info and Bookmarks, respectively. The extension said it had "saved" the changes, but there was no effect. I exited and restarted FF and tried it again, just to be sure. 🤷‍♂️ (I don't have the heart to rate anything just 1 star, though.)