Only in the past couple weeks, Houzz pop-up ads have started appearing when I read the GW forums on my iPad. It never happened before. Does anyone know of a good, free pop-up ad blocker for iDevices?

This is particularly annoying and adds insult to injury, because I stay signed in to GW/Houzz forums all the time on our big desktop PC, but for some strange reason I can NOT sign in on my iPad if I want to comment.

So, I'm looking for a good free pop-up ad blocker for the iPad, if anyone has one they can recommend. Thanks!