Ad blocking on mobile web browsers is relatively commonplace, but it's also annoying when you want to turn it off to support a favorite site (or, let's be honest, to get past a "turn off your ad blocker" warning). Opera thinks it can win you over by making that process as easy as possible. It's releasing Opera 50 for Android with an ad blocker you can toggle on a per-site basis. You just have to flick a slider on or off -- you don't have to think about a whitelist or turning off ad blocking entirely.