An immediate fix is to set xpinstall.signatures.required to false in about:config
0xCEC1B8C7E51FC983.asc
Description: application/pgp-keys
signature.asc
Description: OpenPGP digital signature
An immediate fix is to set xpinstall.signatures.required to false in about:config
0xCEC1B8C7E51FC983.asc
Description: application/pgp-keys
signature.asc
Description: OpenPGP digital signature