https://connect.mozilla.org/t5/discussions/severe-4k-video-playback-stuttering-in-version-141-0-3/m-p/102937#M40011 <P class="">Version 141.0.3 has severe stuttering when playing 4K videos on web pages. Previous versions and the Chrome browser both play them smoothly, so it's definitely not a hardware issue. I hope this can be fixed.</P> Sun, 10 Aug 2025 18:38:59 GMT 1232 2025-08-10T18:38:59Z https://connect.mozilla.org/t5/discussions/severe-4k-video-playback-stuttering-in-version-141-0-3/m-p/102937#M40011 <P class="">Version 141.0.3 has severe stuttering when playing 4K videos on web pages. Previous versions and the Chrome browser both play them smoothly, so it's definitely not a hardware issue. I hope this can be fixed.</P> Sun, 10 Aug 2025 18:38:59 GMT https://connect.mozilla.org/t5/discussions/severe-4k-video-playback-stuttering-in-version-141-0-3/m-p/102937#M40011 1232 2025-08-10T18:38:59Z https://connect.mozilla.org/t5/discussions/severe-4k-video-playback-stuttering-in-version-141-0-3/m-p/106479#M41130 <P>Experiencing 4K video stuttering in Firefox version 141.0.3 is a known issue, often linked to codec handling and hardware acceleration. To address this:</P><UL><LI><P><STRONG>Install VP9 and AV1 Extensions:</STRONG> Ensure both "VP9 Video Extensions" and "AV1 Video Extension" are installed from the Microsoft Store.</P></LI><LI><P><STRONG>Disable AV1 Codec:</STRONG> Navigate to about:config, search for media.av1.enabled, and set it to false.</P></LI><LI><P><STRONG>Update Graphics Drivers:</STRONG> Outdated drivers can hinder video playback; ensure your GPU drivers are up to date.</P></LI><LI><P><STRONG>Test in a New Profile:</STRONG> Create a fresh Firefox profile to rule out configuration issues.</P></LI></UL> Sun, 28 Sep 2025 11:53:24 GMT https://connect.mozilla.org/t5/discussions/severe-4k-video-playback-stuttering-in-version-141-0-3/m-p/106479#M41130 Jeremiah678 2025-09-28T11:53:24Z