Examine source code of Chrome Dino Game

{
  "manifest_version": 2,
  "name": "Chrome Dino Game",
  "version": "1.0",
  "description": "Play the Chrome Dino game directly in your Firefox browser.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c1e6e6dd-d257-4160-a981-8561aa67b4cd}"
    }
  }
}