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Extension to make YouTube stream H.264 videos instead of VP8/VP9 videos

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The extension is to solve a performance problem with YouTube videos.

By default, YouTube streams VP8/VP9 encoded video. However, this can cause problems with less powerful machines because VP8/VP9 is not typically hardware accelerated.

In contrast, H.264 is commonly hardware accelerated by GPUs, which usually means smoother video playback and reduced CPU usage.

Edit: Firefox version now available: https://github.com/erkserkserks/h264ify-firefox

Note that most videos that play on Firefox are already h.264, since it doesn't support MSE with VP9. When MSE arrives, h264ify will also block VP9.

https://github.com/erkserkserks/h264ify