I'll bite. Where can I find a, "block reported attack site" box in Firefox to uncheck.
Could I instead click, "Ignore this warning" in the lower right corner of the warning message window?
Ignore this warning should be fine now. It was something with OpenX's ad platform which has a long history of being exploited, since David said he disabled it, DBSTalk and all of its remaining ads are safe to view. It just takes awhile for Google to completely remove it from their list. However, that doesn't mean every other site who uses OpenX or was compromised some other way did the same.
Now if you have decent virus/malware protection, and you or anyone else who uses your computer know not to click random things that popup, know that web popups that appear to be one of your folders saying it detected a virus is fake, and know to pay attention to the url in the address bar before logging into any site, you can also disable the entire feature under Preferences -> Security -> "Block reported attack sites".