Examine source code of ChatterinoWatch

{
  "name": "ChatterinoWatch",
  "version": "2.0.2",
  "description": "High-performance extension that reports the currently watched Twitch channel to Chatterino",
  "permissions": [
    "nativeMessaging",
    "tabs"
  ],
  "manifest_version": 3,
  "background": {
    "scripts": [
      "browser-polyfill.min.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.twitch.tv/*",
        "https://twitch.tv/*"
      ],
      "js": [
        "browser-polyfill.min.js",
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "host_permissions": [
    "https://www.twitch.tv/*",
    "https://twitch.tv/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "chatterino-watch@chatterinowatch.miguvt.com",
      "strict_min_version": "109.0"
    }
  }
}