I am a senior software team lead. Firefox is getting worse gradually. And they are doing childish acts. You should never make changes to themes without the user consent. You should not make changes for political reasons or marketing reasons. If I am in charge of Mozilla, I would fire multiple managers. I believe this is not a developers issue. Firefox is losing backward and forward compatibility for many web pages. Also it is having more performance issues. Please do not expect users to have time to go to forums to fix issues. Prevent issues in the first place. Is Mozilla being paid by Google to make Firefox more terrible gradually, so all people will be forced to switch to Chrome?