It got a big boost when Mozilla updated their ToS a couple months ago to say they could use your browser data to train their AI.
Well, it’s not that they said they would, it’s that they updated their terms so that they could if they wanted to. For some (myself included) that was enough.
Rather than give you specific recommendations, here’s some guidance for parts
Mobo: The more slots you have for RAM and storage, the better.
CPU: literally anything. More cores and faster cores are ideal, but CPU requirements for these things are generally lower than a desktop.
RAM: Buy 1 stick of the fastest and highest capacity RAM your motherboard can handle. When you’re ready or you start to see slowdown, buy another of the same stick. You can get far on 16-32GB, you won’t need much more until later.
Storage: an SSD for the OS and one or more HDDs for storage.
PSU: generally anything in the 500-700 range will be good. You’ll want more if you plan to put a GPU in, though.