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by mosselman 2490 days ago
Wondering about this as well.

On my 2017 MacBook Pro with touchbar I don't notice the performance hit, but on my 2015 MacBook Pro the whole system freezes with Firefox. What completely solves this however is enabling 'low res mode' (right click app icon -> get info -> check the low-resolution checkbox). But, as the name suggest, Firefox now runs in non-retina resolution. It looks crappier, but I still prefer it to other browsers.