Firefox doesn’t use system certificates, so we need to import the certificate manually.
How to import the certificate manually
Preferences > Advanced > Certificates mini-tab > “View Certificates” button > Authorities mini-tab > “Import” button > cert.pem
Source: https://support.mozilla.org/en-US/questions/1068675
Alternative way
about:config > security.enterprise_roots.enabled = true
Source: https://support.mozilla.org/en-US/questions/1175296
macOS
It’s possible to drag and drop certificates from Finder to Keychain Access.
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