Firefox on Windows not playing MP4 videos

Date: 2021-02-27

Media Feature Pack for N versions of Windows 10 is available for download as an Optional Feature. To install the Media Feature Pack, navigate to Settings > Apps > Apps and features > Optional features > Add a feature, and then locate Media Feature Pack in the list of available optional features.

Windows Media Player is also available as optional feature

46690cookie-checkFirefox on Windows not playing MP4 videos