Examine source code of Deezer Tab

{
  "manifest_version": 2,
  "name": "Deezer Tab",
  "short_name": "Deezer Tab",
  "description": "Discover a Deezer Track every time you open a new tab.",
  "version": "2.0.3",
  "author": "Simon Duhem",
  "icons": {
    "16": "img/icon16.png",
    "48": "img/icon48.png",
    "128": "img/icon128.png"
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "permissions": [
    "https://api.deezer.com/*",
    "storage"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'"
}