Windows 10: Intermittent BSODs for over 1 year- unable to determine the cause

I have had intermittent BSODs- they occur randomly but seem to be more frequent when I have multiple programs open. I would say 80% occur when Firefox is open I have reinstalled several times with no resolution.I have tested the memory using the windows tool and an externally sourced tool from the web- no errors. I have run multiple scans with Windows Defender and Malwarebytes to try and find any malware. No issues with the discs, as verified via check disk. SFC/ scannow found some errors about 2 months ago but the BSODs have kept happening since then.If anyone can suggest anything else I wo

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BSOD Hardware Caused???

they do weird things like that, which all seem like something else is failing.
One of the worst things to diagnose, they seem to only quit when they want to.

Memtest is a good next step, if you rule out RAM and Power Supply make sure you disconnect all unnecessary peripherals and try to start the system with as little hardware as possible, if it works then, you can narrow down the culprit by trial and error.

the follow was taken from some website:

It's very difficult to determine if a failure is caused by the CPU because many other components can cause the same symptom when they fail.

1. System fails to boot
2. System re-boots intermittently
3. General Protection Fault
4. Illegal Operation
5. Stop Error, or BSoD (Blue Screen OfDeath)

Actually, CPUs rarely fail, and about the only way to determine if the CPU is causing the failure is to swap it out with a known working CPU of the same type and speed. Since this is difficult, the best bet is to first rule out every other possibility.

Before suspecting the CPU, rule out all the possibilities listed below.

1. The Operating System
2. A peripheral port device
3. A bad memory module
4. The hard disk drive
5. The power supply
6. The motherboard

If you have ruled out out all the other possibilities, investigate the items listed below.

1. Overheating
2. A short circuit
3. ESD

 

Unable to determine the cause of BSOD DRIVER_POWER_STATE_FAILURE

 

BSOD Hardware Caused???

It is not overheating - CPU runs 60*C in games.
Short Circuit - EXTREAMLY UNLIKELY