There are many different reasons for not upgrading a program.

Mine is a bit ridiculous. I never upgrade the Firefox browser, as a matter of principle. The reason is that last time I did, Firefox would refuse to open new tabs unless it was restarted. I did not want to restart it, since i'm running a few windows in private mode, using different 2FA logins, and that would entail to fill-in a lot of passwords and type a lot of numbers received from several SMS. That was very annoying, and I vowed to never upgrade Firefox again. Does anybody know a workaround for this stupid problem of mine?