AOMedia Video 1 (AV1) is an open, royalty-free video coding format designed for video transmissions over the Internet. It is being developed by the Alliance for Open Media (AOMedia), a consortium of firms from the semiconductor industry, video on demand providers, and web browser developers, founded in 2015. The AV1 bitstream specification includes a reference video codec.
Starting with Firefox 63.0, Mozilla added experimental AV1 codec support to play AV1-encoded videos.
Support for playing AV1 videos in Firefox is disabled by default, but you can enable support.
This tutorial will show you how to enable or disable AV1 codec support to play AV1-encoded videos in Firefox for your account in Windows 7, Windows 8, and Windows 10.