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I am using internet by connecting mobile phone to my laptop using usb. From yesterday,my browser (firefox) shows like this for all most all website. Why this happen? How can i solve this?

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If 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
up vote 3 down vote accepted

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.

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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
@Iszi good point, updated – rook Oct 24 '12 at 19:23

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.

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