"This is a problem, and here is what I/we should do", takes a bit more effort.
Firefox is still open source last I checked. You can still contribute, write bugs, write letters to the CEO, etc...
I'm only taking issue with tendency people have to throw shade without offering a solution.
But it's really hard for a normal person to do much about steering firefox other than helping raise a fuss.
Sometimes there isn't "a solution".
If you don't have something to contribute (like a direction, suggestion, correction), then as they used to say, you are "part of the problem".
And even if it's useless that doesn't make it FUD.
Moreover, when there's a pattern of it occurring, for at least the past 5 years...
Not saying that firefox is perfect, I have issues with its project leadership too, but its nowhere near as bad as the (most vocal) critics like to claim.
If yes then that's an unreasonable standard to hold people to.
If no then I can't figure out what your comment means.