Examine source code of Playlist Tracker

{
  "name": "Playlist Tracker",
  "version": "4.30",
  "description": "Keep track of your YouTube playlists",
  "permissions": [
    "storage",
    "notifications",
    "unlimitedStorage",
    "https://www.googleapis.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/logo_light_firefox.png",
      "32": "images/logo_light_firefox.png",
      "48": "images/logo_light_firefox.png",
      "128": "images/logo_light_firefox.png"
    }
  },
  "icons": {
    "16": "images/logo_firefox.png",
    "32": "images/logo_firefox.png",
    "48": "images/logo_firefox.png",
    "128": "images/logo_firefox.png"
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{9078a6b6-4449-4689-802c-32d94732ba41}"
    }
  }
}