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I just installed FF 63 on a 64-bit Windows 7 machine, and I'm getting SEC_ERROR_UNKNOWN_ISSUER errors at many, but not all, websites. Reaching the same websites via the same URLs using Chrome works fine.

Jun 27, 2019  In newer versions of Firefox, this is under Firefox Tools Options Advanced Certificates Authorities. Click the Import button. This imports the above certificate. Navigate to the certificate file and click Open. Ensure the Trust this CA to identify websites option is checked in the pop-up Certificate Manager window.

I am sorry not to uj the answer to this one, not having the PC hardware myself, but perhaps someone else might like to reply below?Your generosity is a great antidote to the corporate greed of Roland. However after a reboot the UM1 works fine. Extremely helpfull my friendmy UM-1S lives to see another day. And, indeed, when you install Windows 10 onto a machine with the UM-1X plugged in, it remains unrecognised by the new operating system. Having tried edkrol reinstall a couple of times and failed, I realised I had to restart in the special mode to allow unsigned drivers. Roland e 09 midi driver.

All discussions of this problem seem to lead to https://support.mozilla.org/en-US/kb/error-codes-secure-websites?redirectlocale=en-US&redirectslug=troubleshoot-SEC_ERROR_UNKNOWN_ISSUER, but it's not helpful. My antivirus is Bitdefender Free, which appears to have no option for disabling the interception of secure connections.

Running FF in safe mode behaves the same as in 'normal' mode: I get SEC_ERROR_UNKNOWN_ISSUER errors at many (but not all) websites.

Help? As things stand now, FF is pretty close to useless for me.