Examine source code of Inferhythm

{
  "name": "Inferhythm",
  "version": "1.0.4",
  "description": "Get Genius lyrics for the track that's currently being played on Spotify.",
  "permissions": [
    "identity",
    "cookies",
    "https://accounts.spotify.com/api/token",
    "https://api.genius.com/search"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "manifest_version": 2
}