I ran into the problem enough that I switched to Waterfox to get away from it :/
Waterfox is pretty bad compared to FF acc to me. I would live with this problem than switch :(
edit: I refreshed firefox and except for one website, whatsapp and other websites seems to be working fine. Make sure you save the extensions and extension settings (and if you are not logged into your Mozilla account, everything else before you do it, even the themes, I lost a good theme because I didn't save it and even my mozilla account didn't sync it back)
Firefox
/c/firefox
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