Examine source code of ytListPlay

{
  "name": "ytListPlay",
  "description": "Take list of songs in text format and play that list using first song on youtube",
  "version": "1.8.38",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting",
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "*://*.youtube.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "content_scripts.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "/images/yt16.png",
      "32": "/images/yt32.png",
      "48": "/images/yt48.png",
      "128": "/images/yt128.png"
    },
    "default_title": "YT player"
  },
  "page_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "/images/yt16.png",
      "32": "/images/yt32.png",
      "48": "/images/yt48.png",
      "128": "/images/yt128.png"
    },
    "default_title": "YT player"
  },
  "icons": {
    "16": "/images/yt16.png",
    "32": "/images/yt32.png",
    "48": "/images/yt48.png",
    "128": "/images/yt128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ytListPlay@vujanovic.net",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "web_accessible_resources": [
    "background.js"
  ]
}