I come from Windows 7 and still using it.
But i never run into such stuff under Windows 7 for decades!
I’m confused… two tabs was opened, machine with 64gb of ram
we all have our bad days 
Is it still running underneath ?
ps -A | grep firefox
I already restarted it.
15812 ? 00:01:19 firefox
Relax, browser is one of the most complex programs on your system - it will crash eventually depending on your actions or some mistakes / bugs by Mozilla in that case…
P.S. RAM also has likely nothing to do with hard crash 
If you want to know more about reasons, if lucky - go see error journal
journalctl -p3 -xb
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repeated crash ?
or
anything bad here:
journalctl -S 2023-10-14 | grep firefox
edit: command correction
No need for sudo here
No, only one. I hope it will not develop into disease.
Having 64 GB ram isn’t really going to help if the hardware is really dated. Windows 7 came out in 2009. What is the hardware?
inxi -Faz | eos-sendlog
Dell Precision 7520
This is a laptop from 2017. Excellent Linux compatibility, it was delivered with a Linux (Ubuntu 16.04) option. Don’t worry.
Re: Firefox: Sadly, the quality of FF has gone down over the years. More crashes and bugs than on Windows are to be expected. If it’s just once or twice a day, I recommend to just deal with it.
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Have journalctl -f running in a terminal while you use your system as you normally do.
Observe the output if/when you get a Firefox’ crash.
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Or install journalctl-desktop-notification-git from AUR. It will automatically notify you if any error occurred in the journalctl log.
When I play to run echo 'Test: Firefox crashes' | systemd-cat -p err, the popup quickly appears on any DE.
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Why are running in MBR mode instead of UEFI?
Yeah, this machine is beaut.
Aha, get it, will be helpful to find the root cause
Because there is a Windows 7 installation on the same nvme driver. Unfortunately i can’t ditch it due to heavy use of old multimedia software.
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