I have tried every manner of combinations in launch.json adn settings.json including currently,

{
  "type": "firefox",
  "request": "launch",
  "name": "Launch Firefox Developer Edition",
  "url": "C:\xampp\htdocs\xyx\index.html",
  "webRoot": "${workspaceFolder}",
  "firefoxExecutable": "C:\Program Files\Firefox Developer Edition\firefox.exe"
},

Other browsers launch fine. I also checked "liveServer.settings.CustomBrowser": "firefox", in settings.json but the options only allows Value is not accepted. Valid values: "chrome", "chrome:PrivateMode", "firefox", "firefox:PrivateMode", "microsoft-edge", "blisk", null.

How can I use Firefox Developer Edition to launch when debugging in vs code via launch.json?