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Secure websites are coming up not secure and not loading

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Anything related to google is not working, even the search engine. When I try to go to my gmail account, the search bar says it's not secure. Also, there are a couple of other websites that are secure and it's saying they are not. I use 3 other browsers besides Firefox and they are all working fine. Please help!

Anything related to google is not working, even the search engine. When I try to go to my gmail account, the search bar says it's not secure. Also, there are a couple of other websites that are secure and it's saying they are not. I use 3 other browsers besides Firefox and they are all working fine. Please help!

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This is the message I'm getting:

Secure Connection Failed

An error occurred during a connection to mail.google.com. PR_END_OF_FILE_ERROR

   The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
   Please contact the website owners to inform them of this problem.
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You can try to disable DNS over HTTPS.

You can check the connection settings.

  • Settings -> General -> Network: Connection -> Settings

If you do not need to use a proxy to connect to internet then try to select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly.

See "Firefox connection settings":

See also: