Examine source code of PodQueue

{
  "manifest_version": 2,
  "name": "PodQueue",
  "description": "Save webpages with audio in PodQueue, listen later in your favorite podcast client",
  "version": "1.0.1",
  "author": "PodQueue",
  "homepage_url": "https://podqueue.fm",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "38": "icons/icon-38.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "background": {
    "scripts": [
      "browser-polyfill.min.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "38": "icons/icon-38.png",
      "48": "icons/icon-48.png",
      "64": "icons/icon-64.png",
      "96": "icons/icon-96.png",
      "128": "icons/icon-128.png"
    },
    "default_title": "Save in PodQueue"
  },
  "content_scripts": [
    {
      "matches": [
        "https://podqueue.fm/confirm_add_url*"
      ],
      "js": [
        "browser-polyfill.min.js",
        "content-script.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true,
    "chrome_stye": true
  },
  "permissions": [
    "contextMenus",
    "storage",
    "tabs"
  ]
}