If you’re experiencing pop-ups using a non-IE browser when you hit a page with an Adult DVD Daily banner on it, be aware of two things: 1. It’s not harmful and 2. It’s not harmful.
Adult DVD Daily is (inexplicably) putting images served over HTTPS on their banners which is causing a certificate to pop up for non-IE users. (I’m assuming that IE trusts their CA by default, and Firefox doesn’t.)
We correct it as soon as we notice it.
The alternative is for you to accept the certificate, and you won’t be bugged by the pop-ups. We’ve been working with ADD to make sure this keeps from happening in the future.