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by daxhuiberts 2748 days ago
I have the exact same issue. I'm using a fully specced MacBook Pro early 2015 with a Retina screen in a scaled mode (1.5x) and Firefox is extremely slow to use. Scrolling isn't fluid at all and CPU usage is very high. When I put it in the normal Retina mode (2x) it's much better, but still not as fluid as using Chrome, which even on 1.5x mode works and scrolls fluidly.

I'm also using Firefox on an underpowered Ubuntu machine and it works wonderfully there though (no HiDPI screen).