Examine source code of Twitch Inventory Claimer

{
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "twitchinventoryclaimer@schulzjona",
      "strict_min_version": "115.0"
    }
  },
  "name": "Twitch Inventory Claimer",
  "version": "4.1.4",
  "description": "This addon can be used to automatically claim drops and other claimable things on twitch",
  "icons": {
    "16": "icons/icon-16x16.png",
    "48": "icons/icon-48x48.png",
    "128": "icons/icon-128x128.png"
  },
  "permissions": [
    "alarms",
    "storage",
    "notifications"
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "host_permissions": [
    "*://*.twitch.tv/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.twitch.tv/*"
      ],
      "js": [
        "contents/index.js"
      ],
      "run_at": "document_start",
      "world": "MAIN"
    },
    {
      "matches": [
        "https://www.twitch.tv/*"
      ],
      "js": [
        "contents/index_isolated.js"
      ],
      "css": [
        "contents/content.css"
      ],
      "run_at": "document_start"
    }
  ],
  "action": {
    "default_popup": "popup/index.html",
    "default_icon": {
      "16": "icons/icon-16x16.png",
      "48": "icons/icon-48x48.png",
      "128": "icons/icon-128x128.png"
    }
  }
}