A new browser idea

1) Browser with adblocker? Firefox + Adblock covers what you're trying to do.

2) Bad websites = Porn to you. So your browser will block porn out of the box? Then it doesn't sound like your market is "everyone" to me. And, people aren't as puritan as you may think. Especially the puritans.

3) Minimalistic UI? Chrome + Adblock

4) How would you rate it 1 to 5? Make sure you define which is the worst and which is the best, otherwise your data will be unreliable.