Major progress with HW acceleration in sandboxed firefox

Today, I noticed that some videos that used to play in Firefox no longer work. In Microsoft Edge, the videos play but without any sound.

Test page: https://www2.iis.fraunhofer.de/AAC/multichannel.html

firefox - no video when the following CLSID enabled
INI:
# Microsoft AAC Audio Decoder MFT
OpenClsid={32D186A7-218F-4C75-8876-DD77273A8999}

msedge - no audio when the following CLSID enabled
INI:
# MMDeviceEnumerator class
OpenClsid={BCDE0395-E52F-467C-8E3D-C4579291692E}
 
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