Examine source code of HueTube

{
  "manifest_version": 2,
  "name": "HueTube",
  "version": "1.1",
  "description": "Customize Your YouTube Experience with Color!",
  "icons": {
    "32": "icons/logo-32.png",
    "192": "icons/logo-192.png"
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*",
        "*://www.youtube.com/"
      ],
      "js": [
        "ytBar.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e48b7832-7c8d-48d0-a145-a39f8bea733e}"
    }
  }
}