Definitely going to hard disagree with Gabriele Svelto's take. I could point to the comments, however, let me bring up my own experiences across personal devices and organizational devices. In particular, note where he says this:

"I can't answer that question directly because crash reports have been designed so that they can't be tracked down to a single user. I could crunch the data to find the ones that are likely coming from the same machine, but it would require a bit of effort and it would still only be a rough estimate."

You can't claim any percentage if you don't know what you are measuring. Based on his hot take, I can run an overclocked machine have firefox crash a few hundred thousand times a day and he'll use my data to support his position. Further, see below:

First: A pre-text: I use Firefox, even now, despite what I post below. I use it because it is generally reliable, outside of specific pain points I mention, free, open source, compatible with most sites, and for now, is more privacy oriented than chrome.

Second: On both corporate and home devices, Firefox has shown to crash more often than Chrome/Chromium/Electron powered stuff. Only Safari on Windows beats it out in terms of crashes, and Safari on Windows is hot garbage. If bit flips were causing issues, why are chromium based browsers such as edge and Chrome so much more reliable?

Third: Admittedly, I do not pay close enough attention to know when Firefox sends crash reports, however, what I do know is that it thinks it crashes far more often than it does. A `sudo reboot` on linux, for example, will often make firefox think it crashed on my machine. (it didn't, Linux just kills everything quickly, flushes IO buffers, and reboots...and Firefox often can't even recover the session after...)

Fourth: some crashes ARE repeatable (see above), which means bit flips aren't the issue.

Just my thoughts.

force-kills like sudo reboot will show UI on restart indicating it didn't shut down cleanly, but that isn't reported as a crash. You can see how often you actually crash via about:crashes (and also see what happened)

Do you have any evidence that Firefox crashes more?

Also, the latest version of Safari for Windows was released in 2012. How old is your Firefox?