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My country and provider don't block major websites but Google, Yahoo, Facebook and others are blocked on my Firefox. They aren't blocked on my Chrome.
I already tried antiviruses (Avast and ESET NOD) and anti-spyware (MalwareBytes) — what now?
I don't want to use proxies, I want to solve the problem itself on Firefox and Internet Explorer.
OP figured it out (mentioned in a comment below), it was an IP6 issue. @Christian - Please answer your own question with what you did to fix your problem and how you figured it out. It will help future people with similar problems. – Nifle – 2012-08-05T07:14:12.220