I'm a FF user since the early 00's and Firefox will mostly not go away because Google has an interest in using it against monopoly accusations but the reality is bleak..
And the reality is these people ( Google in this case ) are so far removed from any moral compass about the Web ( at least what most people here think of "the Web" ) that it's near impossible to do anything about it. These companies are huge and from top to bottom there are certain groups that are hired guns to do a job, no matter what "job" it is, they'll do it, achieve those KPIs, get promoted, get paid. Even for their own detriment in the future, it doesn't matter. Big money now, screw the rest.
Btw, this is how every big company operated since forever, the only "news" here is the disproportionate impact their acts do to the World due to their huge size and influence.
One company dominates "the Web" and pulls these shenanigans all every other year, the other one is totally dependent of the former to pay their bills.
So yeah, Google has been better managed than Mozilla. That doesn't invalidate Google's execs are a bunch of lizards on the now common SV ego trip and screw up all the time, but they can and ensure they can continue to do so, Mozilla is not in the same position and part of blame must be attributed to them.