Examine source code of F-ZERO-BIG-BLUE game

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "F-ZERO-BIG BLUE",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(233, 237, 240)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(73, 153, 201)",
      "tab_background_text": "rgb(252, 252, 252)",
      "toolbar_field": "rgb(252, 252, 252)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(0, 0, 0)",
      "popup": "rgb(233, 237, 240)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{44a080ed-35b9-4e05-8a29-c25bb8c5a576}"
    }
  }
}