You asked for it so here's my 'bizarre' take;
Mozilla is tangled up with social/political advocacy and virtue signals too hard.
Tries to censor content on Firefox. Recently saw they are introducing a 'Fake' Amazon reviews detector.
Even though they tell anyone who will listen that Firefox is a private browser, they push their own ads in the browser and have even tried pushing 3rd party ads (for some animation movie).
And is poorly run. Example, fired a lot of developers and shortly afterwards increased CEO pay. But most importantly, share of Firefox users have dropped over the past decades from a comfortable lead to less than 3% today.
Trump kissed babies he was smart enough not to use them as bait for a propaganda war.