Removal of plugin support was announced in 2015
- this is not a decision that we are going to reverse.
I encourage you to work on having MIDI support via a Firefox addon. There
are two opportunities here:
1. Ship the MIDI support via a native binary and use native messaging to
communicate (can be done today)
2. Ship a MIDI API via webextensions in the browser itself (would require
core Firefox hacking)
I recommend starting with #1 and gradually moving towards #2 if the
webextensions team agrees that this is a valuable API surface.
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