Tested against Firefox 100.0.1 (Windows) https://ftp.mozilla.org/pub/firefox/releases/100.0.1/win64/en-US/Firefox%20Setup%20100.0.1.exe
The about:blank tab was not redirecting to crash.html for me, so I changed to PoC to open a tab to crash.html directly. Exploit works, not seeing any reliability problems mentioned in the PoC.