For those that are saying things like "Google/Microsoft etc. are worse" and other such pseudo-justifications: You are missing the point!
Mozilla is now in exactly the same camp as Microsoft, Google and all the other spyware companies. There is no "worse" any more! Their rhetoric uses the same language and tactics as the others therefore they are the same now. Their plan is to monetize your web views, just like Google. This change is absolutely not for your benefit. Not even a little bit!
They have crossed a line. A massive line imo!
Firefox held the torch for companies in the "internet space" (couldn't think of a better term) on how to do things without bending your users over and telling them it's for their own good. But no more.
This is the end for Mozilla for a group of people that absolutely care about privacy and (total speculation incoming!) the beginning of the end for Mozilla in general. For a number of years, their userbase clearly was more interested in privacy over speed and features but if the playing field is now levelled (in terms of lack of privacy!), then the obvious choice is no longer FF these days as Chrome and Edge are faster.
I've watched them over the years become worse, bit by dark-patterned bit. This is a huge leap into a steaming pile of privacy shit though and a clear sign they are circling the drain.
Still, I have no idea what to do! Hopefully there sill be a way to turn it off but they've laid their cards on the table now...