Examine source code of OpenSpotifyLinksInApp

{
  "manifest_version": 2,
  "name": "OpenSpotifyLinksInApp",
  "description": "Instead of opening open.spotify.com links in the browser they will always be opened in Spotify. Based on https://github.com/gaqzi/chrome-open-in-spotify-client",
  "version": "1.1resigned1",
  "permissions": [
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "*://open.spotify.com/",
    "*://play.spotify.com/"
  ],
  "background": {
    "scripts": [
      "OpenSpotifyLinksInApp.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1664dc9f-e1b3-47fc-bb37-17c2fb73a02c}"
    }
  }
}