Firefox is BLOCKING Gmail due to securtiy certificate! HELP?? Cannot get my email accounts!!

I just purchased a new Dell laptop with Windows 7 Pro. I downloaded and installed the latest version of Firefox.
I have several very important Gmail accounts but Firefox will NOT allow me access to any Gmail items! There is not even the option to ignore the warning that the security certificate is invalid. I CANNOT get to any Gmail account.
The computer I am replacing also has the latest version of Firefox but it allows access to all my Gmail accounts. The only reason that I am replacing the computer is because Microsoft has stopped supporting XP and all my normal software vendors will no longer support me; so I am forced to change.
One suggestion in Firefox is to go to the Profile file and delete "cert8" and then let Firefox recreate it. THAT DOES NOT WORK with my problem.
Please, can someone help. I have a business to run and I have all day on this issue.
Thanks to anyone that can help.
Chuck

Firefox reports that Google's Gmail has an invalid certificate! No other program does this. In fact, it does not do this on my other computer running the same software. Internet Explorer connects without a problem.
Deleting "cert8" file from Firefox's profile does not seem to work either. What I mean by "seem" is that it might work for a couple of loads then it blocks it again.

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''galoget [[#answer-714108|said]]''
<blockquote>
Hello rodder73,
You can use this add-on to skip that error message:
https://addons.mozilla.org/en-US/firefox/addon/skip-cert-error/
"This Firefox extension enables skipping the SSL/TLS certificate error page, for specific configurable conditions, like self-signed cert or unknown issuer, by adding a temporary exception."
Hope you find it useful.
Cheers!
Galoget
Líder de la Comunidad de Software Libre y Seguridad Informática Hackem
OWASP Ecuador Student Chapter Leader
Mozillian & FSA
Fedora Ambassador for Ecuador
OpenStreetMap Ecuador Leader
======================
Hola rodder73,
Para evitar que se te muestre la pantalla de advertencia de Mozilla Firefox para certificados desconocidos, puedes utilizar el complemento "Skip Cert Error", lo puedes descargar desde aquí:
https://addons.mozilla.org/en-US/firefox/addon/skip-cert-error/
Te adjunto su descripción:
"This Firefox extension enables skipping the SSL/TLS certificate error page, for specific configurable conditions, like self-signed cert or unknown issuer, by adding a temporary exception."
Espero que te sirva.
Saludos!
Galoget
Líder de la Comunidad de Software Libre y Seguridad Informática Hackem
OWASP Ecuador Student Chapter Leader
Mozillian & FSA
Fedora Ambassador for Ecuador
OpenStreetMap Ecuador Leader
</blockquote>
Hi Galoget,
Many thanks for your quick response. I have installed the plugin and tried again, but unfortunately it keeps yielding the same error message:
"''apus20.cert.fnmt.es usa un certificado de seguridad no válido.
No se confía en el certificado porque el certificado emisor es desconocido.
(Código de error: sec_error_unknown_issuer)''"
Based on the plug-in information, this ''unknkown issuer'' error should be skipped but somehow it does not work.
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Firefox is BLOCKING Gmail due to securtiy certificate! HELP?? Cannot get my email accounts!!

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