Browser Development • Re: What can cause this crash on exit?

A code 0x80000003 means it's a deliberate breakpoint, so whatever is causing this is doing so on purpose. If it happens after about a minute, then it's the process watchdog killing Pale Moon after it had failed to shut down normally; this can happen if you've visited a site that causes the JS garbage collector to become "stuck" with a huge blob of uncleanable objects. There's no real solution for that particular problem yet. I've been experimenting with some ways around it but haven't found anything that works well, yet.