Examine source code of Dirt Race

{
  "name": "Dirt Race",
  "manifest_version": 2,
  "version": "5.0",
  "theme": {
    "images": {
      "theme_frame": "DirtRaceH.jpg"
    },
    "colors": {
      "frame": "rgba(54, 42, 25, 1)",
      "tab_background_text": "rgba(245, 255, 61, 1)",
      "toolbar": "rgba(54, 42, 25, 0)",
      "bookmark_text": "rgba(247, 255, 99, 1)",
      "toolbar_field": "rgba(54, 42, 25, 0.05)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8c3fb44f-d7e6-4034-9bac-5d9653e84f8a}"
    }
  }
}