Don't worry about that little thing. All that is doing is blocking a pop up (in this case an ad on) so your browsing of the site does not get interrupted. This causes no harm at all to your computer and is in fact the complete opposite, it stops the page (pop up) from opening therefore saving you from having to see an unwanted page.
Hope that helped. Thread Closed. If you still want to inquire about that then pm myself or another mod/sempai and this thread will be reopened.