Examine source code of Streaming Awake

{
  "manifest_version": 2,
  "name": "Streaming Awake",
  "description": "Turn on/off KeepingYouAwake according to the playback status of music streaming services.",
  "version": "0.0.2",
  "background": {
    "scripts": [
      "kya.js"
    ],
    "persistent": true
  },
  "permissions": [
    "alarms",
    "tabs",
    "<all_urls>"
  ]
}