Examine source code of Snake

{
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "32.png"
  },
  "description": "Snake game",
  "icons": {
    "32": "32.png",
    "48": "64.png",
    "128": "128.png"
  },
  "web_accessible_resources": [
    "style.css",
    "option.js"
  ],
  "manifest_version": 2,
  "name": "Snake Game",
  "options_ui": {
    "page": "option.html"
  },
  "version": "1.0"
}