Examine source code of Spotify Link Opener

{
  "manifest_version": 2,
  "name": "Spotify Link Opener",
  "version": "1.0",
  "description": "Opens Spotify links in the desktop application and closes the tab.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "*://open.spotify.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "dev@heyimjonas.com"
    }
  },
  "icons": {
    "48": "icon.png"
  }
}