It's only in parts recent. Updating Firefox did not have this enforcing message telling you to restart, but before Firefox would just randomly break when update

It's only in parts recent. Updating Firefox did not have this enforcing message telling you to restart, but before Firefox would just randomly break when updated via the package manager. Preventing that is better now. Don't do automatic updates if you do not want automatic updates. Automatic updates just absolutely can cause you to have to restart stuff, depending on what got updated exactly.