Is this with all websites/pages, some, a few?

What were you doing at the time? surfing, watching a clip, reading something . . . .

Diagnose Firefox issues using Troubleshoot(Safe) Mode {web link}

A small dialog should appear. Click Start In Troubleshoot(Safe) Mode (not Refresh). Is the problem still there?

It happens a couple of times a days, but it completely random. It's not correlated with anything I'm doing on the computer since I can leave the computer for a few hours and come back with the browser having quite. I've already tried disabling all the extension with not effect; but I'll restart in troubleshooting mode and see if the problem persists.

Again, the problem here with diagnosing this is that it's not correlated with anything I'm doing.

I'll repost after a day or so in troubleshooting mode.

Firefox is still closing at random times. I've run it in troubleshooting mode and just let it sit and then come back after a few hours to find it has closed. Again, I can that's it correlated to anything I'm doing on the computer. The only thing that seems causally connected to this is that this started right after I updated to the latest version of the browser.

I called for more help.

You can check for issues caused by a corrupted or incomplete Visual C++ installation that is missing runtime components (Redistributable Packages) required by Firefox, especially VCRUNTIME140_1.dll.

I would install both 32-bit and 64-bit "Visual Studio 2015, 2017 and 2019" downloads, (x86: vc_redist.x86.exe and x64: vc_redist.x64.exe) from https://support.microsoft.com/help/2977003/the-latest-supported-visual-c-downloads