Numberfy (Numbers in Spotify)

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Numberfy (Numbers in Spotify)",
  "version": "1.46",
  "description": "Adds numbers to songs in spotify playlists and albums.",
  "manifest_version": 2,
  "icons": {
    "16": "icons/icon_16.png",
    "32": "icons/icon_32.png",
    "48": "icons/icon_48.png",
    "64": "icons/icon_64.png",
    "128": "icons/icon_128.png",
    "512": "icons/icon_512.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://open.spotify.com/*"
      ],
      "all_frames": false,
      "js": [
        "scripts/spotify_numerizer.js"
      ]
    }
  ],
  "page_action": {
    "default_popup": "extension_popup/page.html"
  }
}