palemoon-dev/platform/devtools/client/shared/test/browser_devices.json

{
  "TYPES": [ "phones" ],
  "phones": [
    {
      "name": "Small Phone",
      "width": 320,
      "height": 480,
      "pixelRatio": 1,
      "userAgent": "Mozilla/5.0 (Mobile; rv:39.0) Gecko/39.0 Firefox/39.0",
      "touch": true,
      "firefoxOS": true
    },
    {
      "name": "Big Phone",
      "width": 360,
      "height": 640,
      "pixelRatio": 3,
      "userAgent": "Mozilla/5.0 (Mobile; rv:39.0) Gecko/39.0 Firefox/39.0",
      "touch": true,
      "firefoxOS": true
    }
  ]
}