Now Playing Notifier for Spotify [unofficial]

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Now Playing Notifier for Spotify [unofficial]",
  "version": "0.0.1",
  "manifest_version": 2,
  "description": "Notify the currently playing song on Spotify. This is an unofficial extension.",
  "icons": {
    "16": "icon/16x16.png",
    "48": "icon/48x48.png",
    "128": "icon/128x128.png"
  },
  "permissions": [
    "notifications"
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://open.spotify.com/*"
      ],
      "js": [
        "js/pagescript.js"
      ],
      "run_at": "document_start"
    }
  ]
}