Examine source code of Free MP3 Downloader

{
  "background": {
    "scripts": [
      "/js/background/namespace.js",
      "/js/background.js",
      "/js/Prefs.js",
      "/js/Utils.js",
      "/js/background/Media.js",
      "/js/background/Fb.js",
      "/js/background/Dm.js",
      "/js/background/MailRu.js",
      "/js/background/Twitch.js",
      "/js/background/Vimeo.js",
      "/js/background/Vktc.js",
      "/js/background/Medias.js",
      "/js/background/detect.js",
      "/js/contentScripts/Controller.js",
      "/js/libs/md5.js",
      "/js/libs/jspack.js",
      "/js/background/MainButton.js",
      "/modules/worker.js",
      "/modules/downloader.js",
      "/modules/recorder.js",
      "/modules/streamer.js"
    ]
  },
  "action": {
    "default_icon": "images/icon_16.png",
    "default_popup": "popup.html",
    "default_title": "__MSG_extension_title__"
  },
  "default_locale": "en",
  "description": "__MSG_extension_description__",
  "icons": {
    "16": "images/icon_16.png",
    "58": "images/icon_58.png",
    "128": "images/icon_128.png"
  },
  "manifest_version": 3,
  "name": "__MSG_extension_title__",
  "permissions": [
    "tabs",
    "webRequest",
    "storage",
    "downloads",
    "scripting",
    "declarativeNetRequest"
  ],
  "version": "2.2.1",
  "web_accessible_resources": [
    {
      "resources": [
        "*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "js/contentScripts/core.js"
      ],
      "all_frames": true,
      "run_at": "document_end"
    }
  ],
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "3b5bd17c-08c4-4efe-9af9-e66db42a55a9@mp3downloader"
    }
  }
}