Examine source code of YouTube Pauser

{
  "manifest_version": 2,
  "name": "YouTube Pauser",
  "version": "1.0",
  "description": "Single click the icon to play/pause all of the YouTube tabs",
  "author": "graynk",
  "homepage_url": "https://github.com/graynk/Youtube-Pauser",
  "icons": {
    "48": "icons/icon_48.png",
    "128": "icons/icon_128.png"
  },
  "permissions": [
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/pause.png",
    "default_title": "Pause YouTube"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1873e6d3-97f3-4aa2-aa45-7ec4be4613e1}"
    }
  }
}