I think you'd optimally be able to choose between ads, mining, or paying some kind of token, maybe linked to your (Firefox/Google/etc) account so it could be mi

I think you'd optimally be able to choose between ads, mining, or paying some kind of token, maybe linked to your (Firefox/Google/etc) account so it could be mined on your desktop and used on mobile, or the tokens are just bought. Anecdotally my phone is about 4 years old maybe and the battery still does fine browsing with JS on in Firefox mobile. That is with ublock though.