lascivious, intrusive ads

So basically I simply used a new account on Windows, the configuration of Mozilla Firefox scrambled, because it did not find the added plug-ins. This includes Ad Blocks plus, which is the one that stops pop-up ads(the most annoying and morally dubious ones). Therefore a very disgusting "gratuitous flirting" site appeared. Of course I did not visit any dubious site(keygen, sex-related, pyramidal scheme, make-money-fast, casinos, etc). Ads just appear from any advertising campaigning site.