Impossible to go to Firefox or Mozilla Web sites

I just installed Firefox on my work laptop and imagine my surprise when the first site, I try to visit the site of https://accounts.firefox.com , does not open because:

Accounts.Firefox.com uses an invalid security certificate.
The certificate is not trusted because the issuer certificate is unknown.
(Error code: sec_error_unknown_issuer)

This also happens with support.mozilla.organd virtually every https site I'm trying.

I tried the solutions and the best that no one can say 'remove the cert8.db' file... which doesn't help.

I deleted cert8.db twice and reset Firefox. Nothing I did worked. And the pages of all open them very well using other browsers.

How can I fix it? Or should I give up on Firefox at 10 minutes to try out it...?

Thanks Phillip, I managed to export the certificates of Chrome, and then import them into Firefox. It seems to work more or less (Sync does not work so well but who may be independent).

Thanks for your help, really appreciate it!

Tags: Firefox

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