User Agent: Mozilla/5.0 (Windows NT 10.0; rv:67.0) Gecko/20100101 Firefox/67.0

Steps to reproduce:

I'm running Firefox Nightly Aarch64 on Windows-on-Arm (Aarch64).

Actual results:

The builds from the past few days have failed to start. Clicking the Firefox shortcut results in nothing happening. In a console nothing is printed. I'm unable to start the profile manager. I know at least one other who is affected.

In the Windows event log, I see the following events:

Faulting application name: firefox.exe, version: 67.0.0.6976, time stamp: 0x5c5b61c3
Faulting module name: ntdll.dll, version: 10.0.17763.194, time stamp: 0x824e4e17
Exception code: 0xc0000409
Fault offset: 0x00000000000037a8
Faulting process ID: 0x1904
Faulting application start time: 0x01d4bf97a1fe7770
Faulting application path: C:\Program Files\Firefox Nightly\firefox.exe
Faulting module path: C:\WINDOWS\SYSTEM32\ntdll.dll
Report ID: 00443fe0-ceb7-42eb-9634-373ee603cef1
Faulting package full name:
Faulting package-relative application ID:

Expected results:

Firefox should have started normally.