Examine source code of Fire on your screen

{
  "theme": {
    "images": {
      "theme_frame": "firecropped.jpg"
    },
    "colors": {
      "frame": "#c23c0b",
      "tab_background_text": "#d9c8c8"
    }
  },
  "version": "2.0",
  "name": "Fire on your screen",
  "manifest_version": 2,
  "description": "Fire"
}