Examine source code of Keyword Highlighter

{
  "manifest_version": 3,
  "name": "Keyword Highlighter",
  "version": "1.0",
  "description": "Highlight custom keywords on any webpage.",
  "browser_specific_settings": {
    "gecko": {
      "id": "holasunhui123@gmail.com",
      "strict_min_version": "109.0"
    }
  },
  "icons": {
    "16": "icons/icon.png",
    "48": "icons/icon.png",
    "128": "icons/icon.png"
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": "icons/icon.png"
  },
  "options_page": "options/options.html",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "host_permissions": [
    "<all_urls>",
    "https://*/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ]
}