Examine source code of Spotify Downloader

{
  "browser_action": {
    "default_title": "Chrome Addon v3 Starter",
    "default_popup": "popup/payment.html"
  },
  "author": "Sprise",
  "browser_specific_settings": {
    "gecko": {
      "id": "{b7c8d9e0-1f23-4a56-89ab-0c1d2e3f4a5b}"
    }
  },
  "content_scripts": [
    {
      "js": [
        "content/content.js"
      ],
      "matches": [
        "https://open.spotify.com/*"
      ]
    }
  ],
  "description": "Spotify Downloader",
  "icons": {
    "16": "assets/logo.png",
    "48": "assets/logo.png",
    "128": "assets/logo.png"
  },
  "background": {
    "scripts": [
      "service.js"
    ],
    "persistent": true
  },
  "manifest_version": 2,
  "name": "Spotify Downloader",
  "permissions": [
    "<all_urls>",
    "storage",
    "downloads"
  ],
  "version": "1.0"
}