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Short stutters when watching videos in Firefox Browser 2026

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simon.sanghera
simon.sanghera

Hi, for about the last week (23 Feb 2026) when watching videos in my Firefox Browser, there are short stutters. First noticed in Youtube, so looked for updates to UBO and other extensions. Then noticed the same thing in BBC iPlayer and my4 streaming. It also happens when watching my media via Plex in the browser. It is not my network bandwidth or speed.

When I watch media via my Plex app or videos on VLC media player, there is no stutter.

I have included a link to logs recorded in Firefox profiler as suggested by someone on Reddit. firefox_profiler_2March26 https://share.firefox.dev/4b4moC0

I don't know if this is caused by a Firefox update, a Windows update. Laptop: Asus ROG Flow X16 (2023); Intel i9-13900H, Intel Irix Xe; NVIDIA RTX 4070 (mobile) Firefox 148.0 (64bit)

All drivers up-to-date. Please let me know if the link does not work - my first time trying to upload a link from profiler.

Thanks all.

Hi, for about the last week (23 Feb 2026) when watching videos in my Firefox Browser, there are short stutters. First noticed in Youtube, so looked for updates to UBO and other extensions. Then noticed the same thing in BBC iPlayer and my4 streaming. It also happens when watching my media via Plex in the browser. It is not my network bandwidth or speed. When I watch media via my Plex app or videos on VLC media player, there is no stutter. I have included a link to logs recorded in Firefox profiler as suggested by someone on Reddit. [https://share.firefox.dev/4b4moC0 firefox_profiler_2March26] https://share.firefox.dev/4b4moC0 I don't know if this is caused by a Firefox update, a Windows update. Laptop: Asus ROG Flow X16 (2023); Intel i9-13900H, Intel Irix Xe; NVIDIA RTX 4070 (mobile) Firefox 148.0 (64bit) All drivers up-to-date. Please let me know if the link does not work - my first time trying to upload a link from profiler. Thanks all.

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