What I've found recently is that Linux is surprisingly Firefox's achilles' heel. Canvas and WebGL run easily an order of magnitude slower than Chromium.
Check with https://webglsamples.org if you don't believe it. All of it runs capped at 60 fps on Chrome for me, Firefox struggles to break 30 on mid tier settings in aquarium and stutters horribly throughout most of them. I'm sure it's fast at loading static sites, but I wouldn't ever use it to run any web app. On Windows they're both the same though, which is weird to me.
Check with https://webglsamples.org if you don't believe it. All of it runs capped at 60 fps on Chrome for me, Firefox struggles to break 30 on mid tier settings in aquarium and stutters horribly throughout most of them. I'm sure it's fast at loading static sites, but I wouldn't ever use it to run any web app. On Windows they're both the same though, which is weird to me.