I am using internet by connecting mobile phone to my laptop using usb. From yesterday,my browser (firefox) shows 
for all most all website. Why this happen? How can i solve this?
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open source guy
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2If you want to know the technical details which make the certificate untrusted, then opening the technical details section might be a smart move. – Thomas Pornin Oct 24 '12 at 17:07
2 Answers
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The date/time on your device maybe invalid.
All SSL certificates have a start and end period. Certificates can be compromised and its a good practice to renew them.
rook
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It's true this is a possible cause, but it would be more useful to the asker if you could give a brief explanation as to why. – Iszi Oct 24 '12 at 17:54
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Your mobile provider might be routing everything thru a proxy server that is doing SSL inspection, so it can do content filtering or bandwidth optimisation, which Firefox is detecting as a man-in-the-middle attack.
Graham Hill
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