Examine source code of Twitch Live Easily check

{
  "manifest_version": 2,
  "name": "Twitch Live",
  "version": "1.0.0",
  "description": "Check if a Twitch channel is live directly from your browser (Manifest V2).",
  "permissions": [
    "https://api.twitch.tv/*",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "Twitch Live",
    "default_popup": "popup.html"
  },
  "applications": {
    "gecko": {
      "id": "twitchlive@example.com"
    }
  }
}