Mediawmfdxvad3d11enabled -

It allows for smoother playback of high-resolution videos (like 4K on YouTube or Twitch) by using specialized hardware.

: Specifies Direct3D 11 , the Microsoft API used for the hardware acceleration. Why You Would Change It mediawmfdxvad3d11enabled

media.wmf.dxva.d3d11.enabled is a hidden configuration preference in Mozilla Firefox It allows for smoother playback of high-resolution videos

, "owner": "media-team@example.com", "last_updated": "2026-04-09" mediawmfdxvad3d11enabled

You can see if your browser is actively using this technology by following these steps:

As of recent Firefox versions (Quantum and beyond), this value defaults to . Mozilla has aggressively moved toward D3D11 because D3D9 is deprecated and causes compatibility issues with newer Windows 10/11 builds and modern laptop switchable graphics.