I don't have anything against a little advertising here and there, but those vibrant popup ads that are littered throughout every single post in this forum are just too much. If you are tired of closing multiple ad windows every time you try to navigate a post and hover over a double underlined word, check out the following link. It works for me with the latest version of Firefox. It does take a few seconds after opening a thread to remove the popup links.
Killing intrusive ads with Firefox extensions—contentious.com