Examine source code of Money Highlighter

{
  "manifest_version": 3,
  "name": "Money Highlighter",
  "version": "1.0",
  "description": "Highlight 'money' text on web pages.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png"
  },
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "1235hiiii@thanhvolang.com"
    }
  }
}