Examine source code of YouTube MicroPlayer

{
  "manifest_version": 2,
  "name": "YouTube MiniPlayer",
  "description": "Cria um miniplayer flutuante para vídeos do YouTube.",
  "version": "1.0",
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "16": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9a668c5b-275b-4b78-803c-18101fb05a11}"
    }
  }
}