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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.

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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 Aug 5 '12 at 7:14

You have to check proxy settings in firefox browser, and revise installed firefox addons and their settings.

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Ensure that you are not using a proxy in your system settings and in Firefox's settings. Your LAN settings window should have "Use a proxy server for your LAN" unchecked. In Firefox, you should have "No proxy" selected in its connection settings.

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there was no proxy. I just solved the problem after months, the cause of the problem was called ipv6 – Cristian Aug 5 '12 at 3:44
@Cristian Welcome to Super User. Remember to type your answer in the Answer box below. :) – Michael Hampton Aug 5 '12 at 6:05

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