Examine source code of Redirect for Spotify

{
  "manifest_version": 2,
  "name": "Redirect for Spotify",
  "version": "0.1.0",
  "description": "Redirects open.spotify.com links to your desktop application.",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://open.spotify.com/*"
      ],
      "js": [
        "redirect.js"
      ]
    }
  ],
  "permissions": [
    "webNavigation"
  ]
}