Comment 14 for bug 44062

I'm not too happy about the dns check. There will be false hits. For example,
exedo.nl doesn't have a dns entry. But it really is just a normal domain.
On the other hand, the regexes for the blacklist are no fun. There will be quite
a lot of those checks for every time a cookie is set. If a list of just some
extension would work, it would be easier.