FF is my daily driver (since Quantum in '17) but I've found it really just isn't holding up these days:

• Profiling functions between Chrome/FF reveals that Chrome is frequently considerably faster (usually 60%+)

• During WebGL work I'll often hit blue screens around memory management (this seems to be a relatively recent development)

• Similarly, trying to profile a WebRTC application with video feeds will consistently trigger a blue screen. (I can tell this is from FF, as the browser itself flashes white a few times before the system goes down.)

• Things like the UI changing - while minor - are enough to cause inconvenience, plus the occasional random feature removal (View Image context menu option) indicates that I'm not necessarily the target audience for the browser.

I actually slightly prefer the devtools in FF than Chrome, but there are a number of quirks that have started appearing over the past year or so, ranging from actual bugs to just weird UX.

As I write this, I'm realizing I'd love a browser that's seen more as a devtool than a catch-all web navigator which happens to have a profiler built in.