FF has for me crashed more times in the last week than in the previous year. - Multiple installs on different Linux systems. The last crash was with a clean profile.
And then there's the disappearing dev tools - that's fun.
EDIT:
I hope that there is something weird with my systems. But I fear that the rush to push this out might have been a little hasty.
EDIT EDIT
Apart from the crashes the new FF has been nice. I've been able to largely stop using chromium for dev work - so not all is bad.
You can go to "about:crashes" to get some more information about reported crashes. If you open a crash report and click the "Bugzilla" tab, you can find out if a bug is on file for that specific stack trace.
I have been using Firefox for several months, using Windows 10, and several GNU/Linux distributions, different hardware, etc., and have never experienced a crash.
It's definitely something weird to do with your systems, meaning it's a real bug that you are experiencing, and I am not.
So please share crash reports, and file bug reports. Different hardware/software quirks may reveal bugs in Firefox/Linux/drivers/window managers/anything. By submitting a bug report for Firefox, you may be able to help find a video driver bug, etc.
And then there's the disappearing dev tools - that's fun.
EDIT: I hope that there is something weird with my systems. But I fear that the rush to push this out might have been a little hasty.
EDIT EDIT Apart from the crashes the new FF has been nice. I've been able to largely stop using chromium for dev work - so not all is bad.