Examine source code of Twitter Tomato Launcher

{
  "manifest_version": 3,
  "name": "Twitter Tomato Launcher",
  "version": "1.0.0",
  "description": "Throw tomatoes at tweets 🍅",
  "browser_specific_settings": {
    "gecko": {
      "id": "twitter-tomato-launcher-8f3d2c71@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "host_permissions": [
    "https://twitter.com/*",
    "https://x.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://twitter.com/*",
        "https://x.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "48": "icon-48.png",
    "128": "icon.png"
  }
}