Firefox doesn't block access to Google or Bing, so something else is causing issues. Firefox 52 is also not supported, or safe to use.

Can you please give the exact error message that shows when you go to Google or Bing?

Please see the screenshot for what I am seeing in Firefox 60

www.google.com uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown. The server might not be sending the appropriate intermediate certificates. An additional root certificate may need to be imported. Error code: SEC_ERROR_UNKNOWN_ISSUER

https://www.google.com/search?q=google%2F&ie=utf-8&oe=utf-8&client=firefox-b-1-ab

Peer’s Certificate issuer is not recognized.

HTTP Strict Transport Security: true HTTP Public Key Pinning: true

Certificate chain:

MIIEnDCCAoSgAw {removed text..} iGH0P4=

MIIHljCCBX6gAwIBAgIJANTMjRbVASgjMA {removed text} de4U/d/Do72Nihs59wI=

It sounds like your employer is injecting something into the certificates. Can you inspect the certificate and view the issuer?

Tyler Downer said

It sounds like your employer is injecting something into the certificates. Can you inspect the certificate and view the issuer?

Unfortunately, when I try to inspect the cert, there is no information about the cert. However, I agree that your suggestion about the injection is probably accurate. If that is the case, can you suggest a workaround in Firefox?

How do I send a screenshot?

You are wrong. I have screenshot of Google.com being blocked by Firefox. Tell me how to attach screenshot and you will see.

You are wrong. I have screenshot of Google.com being blocked by Firefox. Tell me how to attach screenshot and you will see.

Says "Connection is untrusted"

Hi jpramac2, earlier you posted:

-----BEGIN CERTIFICATE-----
MIIEnDCCAoSgAw
{removed text..}
iGH0P4=
END CERTIFICATE-----

If you take that certificate gibberish and pop it into a decoder such as the following, it should display out the Issuer information. This could indicate security software or a proxy server.

https://certlogik.com/decoder/

If you like, you can paste it here for consideration.

Also, for an enterprise environment that uses a proxy, you could consider this setting, which will cause Firefox to trust the authority certificates your admins add to the Mac keychain or Windows certificate store:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful or accepting the risk.

(2) In the search box above the list, type or paste enterp and pause while the list is filtered

(3) Double-click the security.enterprise_roots.enabled preference to switch the value from false to true

JimStinson said

How do I send a screenshot?

JimStinson said

You are wrong. I have screenshot of Google.com being blocked by Firefox. Tell me how to attach screenshot and you will see.

JimStinson said

Says "Connection is untrusted"

Hi JimStinson, please start your own question reduce confusion, you are not helping the original poster with your replies:

https://support.mozilla.org/questions/new/desktop/fix-problems

Scroll down on that page to continue with the form.

I made "security.enterprise_roots.enabled = true" and that did not fix the problem.

BTW... thank you for helping me with this issue, I really like Firefox and don't want to use Safari or Chrome...

Hi jpramac2, that is a very weird issuer. I wonder if the administrator is supposed to edit those settings.

If you use another browser and check the certificate information there (for example, in Chrome, I think you can find it in the dev tools under Security, try pressing F12 to open those), does it show that same issuer?

I should say that I edited the issuer name from the original to 'my domain.com'

Please see attached Chrome certificate

Aha. Do you think it's a company proxy? If the "enterprise roots" shortcut doesn't work, you can import the proxy's signing certificate. This is an old thread with the general approach, but I haven't check the specific settings details recently: https://support.mozilla.org/questions/1206606#answer-1081584

yes, that makes sense! I'll try that... thank you

So, I exported my enterprise certificate from my mac keychain and imported it into Firefox (60) and now Google and the other trusted sites are working great. THANK YOU!!