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My old version of Firefox (45) has no problem with security certificates, but new version (59) cannot see google cert and will not allow me to add an exception.

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  • Last reply by Shadow110

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My older Firefox 45.7.0 has no problems with https certificates. I am running this on Linux CentOS 7. I recently downloaded the updated Firefox 59 and ran it. But it cannot run https. It keeps giving me the Connection is not secure (SEC_ERROR_UNKNOWN_ISSUER) error for every https site. And when I click the Advanced button, it does not have a button to allow me to add a security exception.

I added our company network proxy, specifically, even though it is set at the system level, just to see if that helped, but no luck.

I can't get to any https search engine (google, duckduckgo, etc.). Please help.


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Hi, please try a Refresh but Note that this does more than uninstalling and re-installing does. Normal uninstalling does not remove some preferences which may have become corrupt. Please Refresh but do this 1st: Delete your Cookies and Cache and TEST.


TEST....... If no issues then Extensions which need to be added back in 1 at a time and tested ..... Or it is your Profile : Make a new one and test ...:

If is your Profile :

Note: Any customization will revert back to default, you will also need to reinstall Extensions.

Please let us know if this solved your issue or if need further assistance.