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Firefox won't open after each update.
I experienced something similar to this user (https://support.mozilla.org/en-US/questions/1276847) in that for a few updates now I can't start Firefox after every automatic update, it gets me a busy cursor and I can't end it through Task Manager because the process keeps vanish-reappear-vanish.
Unlike that user though, I fixed this by following the method here (https://support.mozilla.org/en-US/questions/1174236) REPEATEDLY. During those repeated reinstall process, I received error messages like "missing mozglue.dll", "missing fir-(something)", "can't load xpcom", and etc. (Yes, I'm sorry I couldn't screenshot them for proof and better explanation purpose.)
So I'm wondering, why am I getting so many error messages like that? Is there a way to fix this, so hopefully I won't have to do the whole reinstall process(es) every time there is an update?