Firefox your connection is not secure sec_error_unknown_issuer adguard

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With so many files and or you have details to and overwhelmed during the installation process, which inevitably leads to or faulty SSL certificate.

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How to Fix Your Connection is Not Secure Sec Error Unknown Issuer
This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox may only connect to it securely. As a result, it is not possible to. I already fixed my problem. I got AdGuard installed in my PC, decided to uninstall it and everythings working perfectly now. Thank you. A bug happened! Can't browse anything even with google or other trusted website because of this SEC_ERROR_UNKNOWN_ISSUER with adguard installed.