As it says in the subject line, the `reopen closed tab` keyboard shortcut cmd+shift+T doesn't do anything on Firefox for MacOS. Weirdly enough, the keyboard shortcut for `new tab` cmd+T does work, as does the other typical shortcuts (search, cut, copy, paste, new window, reopen closed window, etc.). So I'm puzzled why this one is the exception. I've also noticed that using the other shortcuts light up the respective menu in the top bar (File when cmd+T, Edit when cmd+F, Bookmarks when cmd+shift+O, etc.), but pressing cmd+shift+T does not. Not sure if that's a useful hint or not. I can still right click the current tab and select `Reopen closed tab` option from there, which is what I've been doing, but it definitely interrupts the flow I have when all of the other usual shortcuts I use work and then this one doesn't. Thank you, and have a good day.