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> Firefox is too slow.

Really? I didn't notice. Mozilla are working on the new generation of browser engine anyway (Servo), which is much more performant. However Firefox itself is nowhere slow.

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Also try using apps which use flexbox intensively — FF triggers exponential slowdown when handling deeply nested flexbox layouts[0]...

[0]: https://github.com/philipwalton/flexbugs/issues/8

I'm not sure why it's reported somewhere on Github and not in Firefox Bugzilla. If reporter cared about the bug he had to report it in the right place.

I think "firefox is slow" partialy comes from people using css3 animations eg. this http://bartaz.github.io/impress.js/#/bored works smooth on my MBP as well as on my Ubuntu desktop whereas seems sluggish on FF (on both platforms)

Looks pretty smooth to me in the latest Firefox (Debian testing), but if somewhere it's a bottleneck, to improve that Firefox should fully implement OMTC.

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