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I can not sign in on some web sites

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I cannot sign in on some web sites that work perfectly well in IE can you help please, as far as i can see firefox is not being blocked by my firewall, I am using windows XP with all updates.

I cannot sign in on some web sites that work perfectly well in IE can you help please, as far as i can see firefox is not being blocked by my firewall, I am using windows XP with all updates.

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This happens a lot when cookies are not enabled.
Did you try some advice from this page?
https://support.mozilla.com/en-US/kb/Cannot%20log%20in%20to%20websites