Hi Firefox cannot directly cause an IRQL_NOT_LESS_OR_EQUAL bugcheck What the debugger likely showed is that Firefox was the actively running application when the crash occurred. The true culprit is almost always a kernel-mode driver that was processing a request initiated by Firefox. Bugcheck Code: 0x0000000a (IRQL_NOT_LESS_OR_EQUAL) It means that the operating system kernel, or a driver running in kernel mode, tried to access a memory address to which it did not have permission, often because it was executing at an elevated IRQL (like DISPATCH_LEVEL or higher) but attempted to use pageable memory. Parameters: 0x0000000000000030: The memory address referenced. 0x0000000000000002: The IRQL at the time of the access (2 = DISPATCH_LEVEL). 0x0000000000000000: The type of access (0 = Read operation). 0xfffff80274225392: The instruction address that referenced the memory. I recommend to update your Graphics Driver (GPU) and/or Network/Wi-Fi Driver. For a definitive answer, you'd need to use a tool like WinDbg to analyze the minidump file created during the crash. This would pinpoint the specific driver file that contains the instruction address 0xfffff80274225392.