Examine source code of Youtube FTW

{
  "manifest_version": 2,
  "name": "Youtube FTW (Full Tab Window)",
  "version": "1.2",
  "description": "Open any youtube video to the fullsize of your tab window",
  "icons": {
    "16": "res/icon16.png",
    "32": "res/icon32.png",
    "48": "res/icon48.png",
    "96": "res/icon96.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "res/icon16.png",
      "32": "res/icon32.png"
    },
    "default_title": "Youtube FTW (Full Tab Window)",
    "default_popup": "popup/settings.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "lib/browser-polyfill.js",
        "js/youtube-ftw.js"
      ],
      "css": [
        "css/youtube-ftw.css"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "*://.youtube.com/*",
    "*://www.youtube.com/*",
    "storage"
  ]
}