Examine source code of Solarcell007

{
  "manifest_version": 2,
  "name": "Solarcell007",
  "description": "Firefox extension to be notified when Solarcell007 is streaming",
  "version": "1.0.6",
  "homepage_url": "https://www.twitch.tv/solarcell007",
  "permissions": [
    "https://api.twitch.tv/*",
    "notifications",
    "alarms"
  ],
  "background": {
    "scripts": [
      "jquery.min.js",
      "background-script.js"
    ]
  },
  "icons": {
    "48": "icon/solar-48.png",
    "96": "icon/solar-96.png"
  }
}