Might be the Google ads that got turned on recently. In Firefox, I have ABP & NoScript on, and all of Google's ads are blocked as untrusted. Know the forum needs to many money to keep the site up and all, but I hate adds all over the place.
Used to be able to block a lot of the banner ad feeds in facebook, but the idiots got wise and embedded their ads into the running code. So if you blocked the ads you also couldn't see anything else recognizable by a human.