Examine source code of Let me reject

{
  "name": "Let me reject",
  "description": "Auto removes or rejects cookie prompts",
  "version": "1.4",
  "manifest_version": 3,
  "permissions": [
    "scripting",
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "letmereject@hdev"
    }
  }
}