I have to confess that I currently have Adblock turned on for the site. I did try to keep it off for about a month recently, but experienced huge browser slowdowns, especially when I had several tabs open (eg to keep track of several mods I wanted to look at). On one occasion Firefox actually crashed on me. Turning on Adblock fixed this completely, so it was presumably something to do with the ads - perhaps because they were all trying to get the data they needed to run simultaneously, and not getting it because of my slow internet connection. Or perhaps just that they run inefficiently, and having too many running at once inevitably causes problems? I'd love to disable Adblock on the nexus, but until that gets fixed I'm afraid it has to stay.