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WebGL2 does not work after update

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I'm running Firefox inside VirtualBox machine with Direct3D enabled. WebGL in version 61.0 x64 was working fine only with "webgl.webgl2-compat-mode=true". After update from 61.0 to 62.0 (x64) WebGL 2 became disabled. WebGL test on browserleaks.com reports "This browser supports WebGL 2: False (supported, but disabled in browser settings, or blocked by extensions)" I did not install any extensions, also checked config "webgl.enable-webgl2=true". Also I tried changing "webgl.webgl2-compat-mode", it does not affect the problem.

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Also, renderer is reported to be ANGLE, with Direct3D support (VirtualBox supports Direct3D9 only)