Examine source code of snakes-on-a-screen

{
  "manifest_version": 2,
  "name": "snakes-on-a-screen",
  "version": "0.0.0.1",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "p5.min.js",
        "sketch.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "snake_icon16.png",
    "48": "snake_icon48.png",
    "128": "snake_icon128.png"
  }
}