When set to true , Firefox asks Windows Media Foundation to use DirectX 11 for decoding.
An API that allows video decoding to be offloaded from your CPU to your GPU (Graphics Card). D3D11 (Direct3D 11): mediawmfdxvad3d11enabled
, "owner": "media-team@example.com", "last_updated": "2026-04-09" When set to true , Firefox asks Windows
Double-click the entry (or click the toggle button) to switch it between Restart Firefox for the changes to take effect. The term appears to relate to enabling or
The term appears to relate to enabling or configuring video decoding or rendering using Direct3D 11 and DXVA, likely within a Windows environment.
To understand why this setting matters, it helps to break down what it actually does. What is WMF, DXVA, and D3D11? The name is an acronym for three core Windows technologies: WMF (Windows Media Foundation): The modern multimedia framework for Windows. DXVA (DirectX Video Acceleration):
When set to "true," the browser attempts to use your graphics card to process video. Why This Setting Matters