Some other users are having problems with Google sites that may be intermittent. Possibly related thread started yesterday: https://support.mozilla.org/questions/1151744. That is unsolved, but you might glance through it for additional suggestions and what happened when that poster tried them.

Can you rule out a malware infection? The reason I ask is in case third party software is impersonating Firefox, and Google is shutting out Firefox temporarily because it looks like a bot. This article suggests tools for scanning/cleaning Windows systems: Troubleshoot Firefox issues caused by malware. The programs are free (or have free trials not requiring any payment card information).

can i ask Where are you from ؟

If you don't want to exchange that information on a public discussion, you can click the other user's username and send a message.

jscher2000 said

Some other users are having problems with Google sites that may be intermittent. Possibly related thread started yesterday: https://support.mozilla.org/questions/1151744. That is unsolved, but you might glance through it for additional suggestions and what happened when that poster tried them. Can you rule out a malware infection? The reason I ask is in case third party software is impersonating Firefox, and Google is shutting out Firefox temporarily because it looks like a bot. This article suggests tools for scanning/cleaning Windows systems: Troubleshoot Firefox issues caused by malware. The programs are free (or have free trials not requiring any payment card information).

Thanks for replying. I'll check that thread. I also scanned my PC using Avast and Malewarebytes, I'll try to use the other scanning/cleaning programs today.

werty20 said

can i ask Where are you from ؟

Thanks for replying. I'm from Egypt. I don't use proxy or vpn.

Update: the problem disappeared about an hour ago and I can access google normally from firefox. I didn't change anything or do anything. I'll post again if anything happens.

The problem appeared again.

You can check the date and time and time zone in the clock on your computer: (double) click the clock icon on the Windows Taskbar.

• https://support.mozilla.org/kb/what-does-your-connection-is-not-secure-mean
• https://support.mozilla.org/kb/secure-connection-failed-error-message

Check out why the site is untrusted.

• click the "Advanced" button to expand this section to see extra details.

If the certificate is not trusted because no issuer chain was provided (sec_error_unknown_issuer) then see if you can install this intermediate certificate from another source. Click the "Add Exception" button to inspect the certificate in the Certificate Viewer.

If you can't inspect the certificate via "Add Exception" then try this:

Open the "Add Security Exception" window by pasting this chrome URL in the Firefox location/address bar and check the certificate:

• chrome://pippki/content/exceptionDialog.xul

In the location field of this window type or paste the URL of the website with the https:// protocol prefix (https://xxx.xxx).

• retrieve the certificate via the "Get certificate" button
• click the "View..." button to inspect the certificate in the Certificate Viewer

You can inspect details like the issuer and the certificate chain in the Details tab of the Certificate Viewer. Check who is the issuer of the certificate. If necessary then please attach a screenshot that shows the Certificate Viewer with the issuer.