Examine source code of Threads Quick Actions

{
  "manifest_version": 3,
  "name": "Threads Quick Actions",
  "version": "1.0.0",
  "description": "Adds always-visible Save, Not interested, and Block action icons to each Threads post.",
  "content_scripts": [
    {
      "matches": [
        "https://www.threads.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "threads-quick-actions@local",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}