This sounds like a piece written by someone hurt in the place that is highest, when plucking strawberries.
What a whining "opinion", and opening up for others to whine too...
You know what? Not a single one, can find a browser that does everything you want, the way you want it done, and only that. _Now, grow up, and then start influencing the best browser, who has fought for decades for users rights and privacy. The reason they have to compromise a bit, is because users just don't care - in general.
FF's performance on Meta sites in general is terrible. Slow loading at best, other times they don't load at all. On my Macs, the FirefoxCP RDD process periodically gets into a state where FF stops responding to mouse clicks and has to be force quit. There's an about:config setting to deal with that but it doesn't work for me. Frankly, I don't think cramming in some AI crap is going to fix any of this.