I had the opposite problem where using my (recent-ish) cheap midi keyboard with WebMidi was crashing Firefox.
That's usually caused by cheap controller firmware flooding the connection with continuous Active Sensing signals (0xFE bytes every 300ms) or noisy clock jitter.
alt Hacker News
That's usually caused by cheap controller firmware flooding the connection with continuous Active Sensing signals (0xFE bytes every 300ms) or noisy clock jitter.