revised 27/09/2024: still working at macOS12.7.6 w. FF127.0.1, if you've issue "Always allow ..." go FF about:config>security.external_protocol_requires_permission cf.: support.mozilla.org/en-US/questions/1321723
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Suddenly not working at FF75.0 @macOS10.15.1, pls. help. how to debug? thx!
EDITed after 9 months, still not working at macOS 10.15.6. why? how to debug? pls help!
[2021.02.10] Would still appreciate if you could update this, because it is not working. why?