Hi leokhoa, first of all thank you SOOO much you have ended 3 months of spending half my time tweaking local settings in 4 other setups. (Windows 10)
I added Laragon's SSL certificate by using Menu > Apache > SSL > Add to Trust Store
But, FireFox still gives error:mysite.test uses an invalid security certificate. The certificate is not trusted because it is self-signed. Error code: MOZILLA_PKIX_ERROR_SELF_SIGNED_CERT
I can see the certificate in Windows' Certificate Manager under "Trusted Root Certification Authorities/Certificates". Might not be a problem while working in WordPress.