Examine source code of CrossTracker

{
  "manifest_version": 3,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "1.4.1",
  "icons": {
    "128": "/icon.png"
  },
  "default_locale": "en",
  "host_permissions": [
    "*://*.twitch.tv/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c8422a08-c8e2-4f12-bd83-7a2a620c0eee}",
      "strict_min_version": "128.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.twitch.tv/*"
      ],
      "all_frames": true,
      "run_at": "document_start",
      "js": [
        "content-scripts/twitch.js"
      ],
      "world": "MAIN"
    }
  ]
}