I realize this is a slightly old thread, but not only is it impossible to get rid of the pop-up/over ad from a mobile (I finally gave up trying), it also won't dismiss (at least for me) from a normal desktop computer using Firefox. I click the X several times, nothing happens. In frustration I tried doing a hard refresh of the page, and that gets rid of it...but cripes. There has GOT to be a fix and/or happy medium.
I shouldn't HAVE to install the app again just to read this forum, a mobile phone forum at that, from my phone. Talk about the ultimate irony.
And the fact that the ad won't dismiss by clicking the X tells me there's something wrong with the ads' code, period.
I'm also located in the US, if that's still relevant (I saw there was some discussion on that).