So much Mozilla bashing in the comments here. And in general.

Mozilla doesn't improve Firefox: FF is so slow I am using only Chrome now. Mozilla improves Firefox: why did you break my extensions. Mozilla add data collection: you are no better than Chrome. And so on...

Meanwhile Google is doing most of these things with Chrome and nobody complains.

The title is correct, Firefox is on a slippery slope. But this is slippery slope to oblivion. Whatever Mozilla does is wrong. But see now, the game is very different nowadays. The browser is not simply a renderer for Html. The browser has turned into the TV from 1984. And the Web game is very very different. So no need to be angry at Mozilla, they are just a player trying to adapt to this new reality.