Examine source code of YouTube Auto Pause/Play

{
  "manifest_version": 2,
  "name": "YouTube Auto Pause/Play",
  "version": "1.0",
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "description": "Automatically pauses and plays YouTube videos across multiple tabs.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{5cc1a451-c045-4a71-8818-88dd83f8c745}"
    }
  }
}