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Youtube 15+ sec. Freezes with VP9,no problem with h264 but limited in quality.

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for a while now i got a problem with firefox on my PC.

I watch a lot of youtube but have the issue that the Videos freeze for 15+ seconds every few seconds if i use the standard VP9 codec. If i switch to h264 via the H264ify addon it works like it should but i'm limited to 1080p (since youtube removed support for 1440p+ on h264)

CPU is a i5 4690k GTX 970 16GB Ram.

Addons: h264ify ublock i don't care about cookies Popup blocker.

I've disbabled all addons but with the same result. Videos on Edge run perfect, even with the VP9 codec.

I've switched several things in the about:config settings found on other websites without solution. (i would list them if i knew what thread they were in)

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