It's in the dependent bugs :)
Bug 1654832 Comment 7 Edit History
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It's in the dependent bugs :) Before this bug GeckoView would not store permissions and instead delegate them to the app, so it would ask for it every time it was needed. This didn't work well in Gecko where sometimes permissions need to be checked synchronously (and delegating to the app is inherently async) so we moved to a world where GeckoView stores permissions much like Desktop does.