Get the noscript extension
https://addons.mozilla.org/extensions/m ... =10&id=722
It allows you to whitelist sites that you want java script (and hence any popups or what not) to execute. I no longer get the popunder when coming here. The caveat is: To use the Emoticons in replies, you have to enable java (by right clicking on no script). When you do this, it will reload the page, and you'll get the popunder for that session. If you know the shortcut keys for the smilie, you have no problems though.