Examine source code of Classic Snake Game

{
  "manifest_version": 2,
  "name": "Snake",
  "version": "1.0.2",
  "description": "Waiting for your internet to come back online, or a web page to load? Or do you just want to have a bit of fun in some spare time? This classic snake game is for you! Controls: Arrow keys to move and the slider changes snake speed, though it is disabled during a game.",
  "icons": {
    "32": "icons/icon.png"
  },
  "browser_action": {
    "default_icon": "icons/icon.png",
    "default_title": "Snake",
    "default_popup": "popup.html"
  },
  "permissions": [
    "storage"
  ]
}