It's technologically possible, but not legally possible and not convenient. People in the know have the right extensions to block stuff and get past paywalls u

It's technologically possible, but not legally possible and not convenient. People in the know have the right extensions to block stuff and get past paywalls using the right snapshot services etc. Firefox can't officially offer this, but they can let people do whatever they want if they run their own extensions. If this was common place or convenient for the masses then it would be actively discouraged or outlawed, similar to what happened with Napster and MP3s.