none of those features are slop. They are amazingly useful features. Removing them from the hands of average users by putting them behind an extension would make Firefox a much worse option and exclude a ton of people for no reason.
Your opinion is based on nothing and you have no idea what you're talking about. You're just a reactionary.
There is only an environmental impact in AI in training in the places that have water issues or use fossil fuels on the grid. Otherwise its the same as any other power use.
Plus model training costs arent relevant to firefox. We dont factor in the power usage for creating the linux kernel when we talk about linux or any other software. There isnt any good reason we should care about 3rd party companies power generation costs. I dont think about how much power the steel plant used to build my car nor should I.