Examine source code of techno-racer1

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "techno-racer1",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(71, 77, 78, 0.7)",
      "toolbar_text": "rgb(199, 0, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(23, 44, 223)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(153, 255, 0)",
      "tab_line": "rgb(199, 0, 255)",
      "popup": "rgb(23, 44, 223)",
      "popup_text": "rgb(153, 255, 0)",
      "tab_loading": "rgb(199, 0, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6a63ccc8-9591-4dfc-a1bf-00d2a8aa23d9}"
    }
  }
}