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How to fix the error "This link is not verified (sec_error_expired_certificate)" in Mozilla Firefox

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This connection is not verified 
It has asked Firefox to connect securely to example.com, but can not confirm that your connection is secure. 
Normally when you try to connect securely, sites have verified information to ensure you are in the right place. However, this site's identity can not be verified. 
What should I do? 
If you regularly access this site without problems, this error may be happening because someone is trying to impersonate the site, and should not continue. 
If in the 'Technical Details' it says: (Error code: sec_error_expired_certificate), it may be for two reasons: 
The certificate of the web server expired, so we'll have to wait maybe a day a revamp. We do not have to do anything for us, and does not depend on us. 
The date and time on your computer is older than the certificate, so you must change it by double clicking on the clock on the taskbar.
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