The problem I see is that these adds are on the increase. Many toimes you can't even find the X button, or it only pops up if you hover over the add, which means they got your attension. Well, of cousre they did, the damned thing blocks what you are trying to view.

I hear AdBlock works well, but I'm afraid to install it. I'm concerned that it would throw emails I need into spam. Did you ever use it?