Maybe use the unbranded build of firefox? It has the great side effect of allowing you to actually edit and install extensions/add-ons without having to use Moz

Maybe use the unbranded build of firefox? It has the great side effect of allowing you to actually edit and install extensions/add-ons without having to use Mozilla's security theater automated signing portal. When some rare website doesn't work in my daily driver freedoms-respecting browser I'll load up Mozilla Firefox unbranded to do what needs to be done then close it.