I confirmed that that the patch worke with pref "media.geckoview.autoplay.request" = false on geckoview example app.
Bug 1736793 Comment 2 Edit History
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I confirmed that that the patch work with pref "media.geckoview.autoplay.request" = false on geckoview example app.
I confirmed that that the patch work with pref "media.geckoview.autoplay.request" = false on geckoview example app at the following. https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API/Tutorial/Animating_textures_in_WebGL