You can install it from their binary releases: https://support.mozilla.org/en-US/kb/install-firefox-linux#w...
I think if you do the "system" install, it won't be able to update itself, but the user install will be able to.
I think if you do the "system" install, it won't be able to update itself, but the user install will be able to.
Though you'll have to convince Ubuntu to prefer that instead of the snap. It's not hard, certainly easier than installing Debian which is probably still what I should have done. I think I used this guide: https://www.omgubuntu.co.uk/2022/04/how-to-install-firefox-d...
Though what that doesn't tell you is that the snap install has its own profile folder location. So before you switch to one of the other install variants, note the location in about:support and make a copy of the folder. Running snap remove firefox will actually create a backup of the folder (unless you add --purge, so don't), which really saved my ass.