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How best resolve "Warning: Potential Security Risk Ahead" for local services URLs?

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Hi. Have searched FF help re "Warning: Potential Security Risk Ahead" but I don't see a clear answer that I understand!

I have my Router, NAS, etc. with local URLs (192.168...) to access their web front-ends. FireFox (FF) is set to "Enable HTTPS-Only Mode in all windows". Whenever I enter these URLs into FF it gives me the error "Warning: Potential Security Risk Ahead". For my router it says certificate MOZILLA_PKIX_ERROR_SELF_SIGNED_CERT. For my NAS it says SEC_ERROR_UNKNOWN_ISSUER. Both are very reputable companies, but clearly have not provided well prepared Certificates. I can of course "Accept the risk and continue", since I know both are valid local services. But this has to be done each time. My "acceptance" is not retained.

Is there a better, safe solution? If so, please explain in easy language for the non-technical reader.

Many thanks.

Hi. Have searched FF help re "Warning: Potential Security Risk Ahead" but I don't see a clear answer that I understand! I have my Router, NAS, etc. with local URLs (192.168...) to access their web front-ends. FireFox (FF) is set to "Enable HTTPS-Only Mode in all windows". Whenever I enter these URLs into FF it gives me the error "Warning: Potential Security Risk Ahead". For my router it says certificate MOZILLA_PKIX_ERROR_SELF_SIGNED_CERT. For my NAS it says SEC_ERROR_UNKNOWN_ISSUER. Both are very reputable companies, but clearly have not provided well prepared Certificates. I can of course "Accept the risk and continue", since I know both are valid local services. But this has to be done each time. My "acceptance" is not retained. Is there a better, safe solution? If so, please explain in easy language for the non-technical reader. Many thanks.

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