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Sadly, FF still slows to a crawl on OSX and it makes it unusable for me. I can't even watch a Youtube video without it skipping frames.

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Try h264fy: https://github.com/erkserkserks/h264ify-firefox It forces h264 on youtube, which is HW-accelerated

That sounds like graphics drivers issues to me; I would double-check that.

Unless you're running a Hackintosh or a customized Mac Pro, there's no such thing as a "graphics driver issue" on macOS (if the rest of the system works fine).

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