[gsvelto]

From the looks of it you have a minuscule page file (16MiB), that's why you're running out of commit space. I suggest setting it to auto-resize (the Windows default) which should provide a much better experience even with other applications, unless you need to keep it small because of storage concerns. Generally speaking Windows behaves very poorly with small swap files because of its inability to overcommit memory.

[LoganDark]

Firefox should not be relying on overcommit in the first place. The issue isn't that I "only" have 40GB of commit space - it's that Firefox keeps taking more and more to the point of crashing (itself and everything else I have running).

And yes, my page file had grown to 64GiB before, when I stupidly left it on automatic. There's a reason it's at 16MiB now - it's because completely turning it off disables memory compression. Not like that helps much due to the lack of overcommit.

[gsvelto]

You're assuming that Firefox is eating all your commit space, but it's not, far from it, I can see it from the crash reports. You've got other applications running and they are also fighting for it, leaving large chunks unused. Without some swap space available Windows is leaving 10+ GiB of physical memory free which it cannot use for anything else.

This is how Windows behaves by design, there's nothing we can do about it. Windows without a swap file sucks.