It's possible to hit the MOZ_CRASH [here](https://searchfox.org/mozilla-central/rev/01d1011ca4a460f751da030d455d35c267c3e210/dom/media/eme/MediaKeySystemAccessManager.cpp#98) if one closes a Window requesting MediaKeySystemAccess at just the right/wrong time. I noticed this while debugging other EME related issues. We should downgrade this crash to a log as it causes pain when debugging and can conceivably be hit in normal usage.
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It's possible to hit the MOZ_CRASH [here](https://searchfox.org/mozilla-central/rev/01d1011ca4a460f751da030d455d35c267c3e210/dom/media/eme/MediaKeySystemAccessManager.cpp#98) if one closes a Window requesting MediaKeySystemAccess at just the right/wrong time. Easiest way to repro is to rapidly open and close a page that requests MediaKeySystemAccess, though I've only hit it a couple of times and it's taken me 10s of attempts each time. I noticed this while debugging other EME related issues. We should downgrade this crash to a log as it causes pain when debugging and can conceivably be hit in normal usage.