According to MDN Safari clamps it to 4 or 8, but Firefox does not: https://developer.mozilla.org/en-US/docs/Web/API/Navigator/h...

I always found it annoying that CPU information was widely available and precise while memory information was not - it's clamped to 0.25, 0.5, 1, 2, 4 or 8 GB. If you're running something memory-bound in the browser you have to be really conservative to avoid locking up the user's device (or ask them to manually specify how much memory to use). https://developer.mozilla.org/en-US/docs/Web/API/Device_Memo...