It's strange hearing reports of "scroll lag" in the other comments. It's possible I'm just lucky. Or there's a misconfiguration somewhere in their setup that Chrome somehow avoids.
It's true that I still mostly use Chrome for webdev - I've become more used to it's (excellent) dev tools, even though Firefox and Firebug started that whole trend. It feels very right to separate my "user browser" from my "dev browser" in this way!
I'm working on a pretty nasty (legacy and poorly optimised) but otherwise still rather "normal" website at work.
Opening the dev tools makes Firefox hang for almost a minute, I suspect this is due to some issue with source maps, thousands of source files and large (several megabytes of) minified code.
The debugger often reports _wrong_ values on hover especially in useEffects whereas console.log shows the right one.
Other than the js debugger I have 0 problems with the Firefox devtools, it often spearheads features that I use on a day-to-day basis like highlighting grid layouts. Super nice!