Erroneous deprecation message and a broken package

Hello Nixers,
trying to update my “legacy” system-wide Firefox config I’ve encountered a broken deprecation warning

trace: warning: The `programs.firefox.nativeMessagingHosts.bukubrow` option is deprecated, please add `bukubrow-host` to `programs.firefox.nativeMessagingHosts.packages` instead.

bukubrow-host actually seems to be just bukubrow or

firefox.nativeMessagingHosts.packages = with pkgs; [

And a broken package cie-middleware-linux who cause a rebuild error.

Having stated the above: for someone who do not use Github, what’s the “right way” to report such issues? A mail to the maintainer for anything showing one?