This is only a big deal if you use a notebook with a restricted screen size to access the forums. But in that case, the advertisements are in the way. With a small screen the ad overlays the forum menu on the left and you can't access it. When you click on Forum index at the top of the page, you CAN see the menu but when you click on it then, you get a page "plugin finder service" / don't know where that comes from.
Just some feedback, I guess this doesn't affect many people but it keeps me from accessing the website with my notebook.