Examine source code of YouTube Background Player

{
  "manifest_version": 2,
  "name": "YouTube Background Player",
  "version": "1.0",
  "description": "Play YouTube videos in the background with speed and resolution settings.",
  "permissions": [
    "tabs",
    "activeTab",
    "webRequest",
    "webRequestBlocking",
    "*://*.youtube.com/*"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{001189c5-2da7-48a3-ae29-8a338c10481f}"
    }
  }
}