Examine source code of Highlight Searcher

{
  "manifest_version": 2,
  "name": "Highlight Searcher",
  "version": "1.0",
  "description": "Search highlighted text using a keyboard shortcut.",
  "permissions": [
    "activeTab"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "search-highlighted-text": {
      "suggested_key": {
        "default": "Ctrl+Alt+Z"
      },
      "description": "Search highlighted text"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c91440d1-6166-4e2a-b826-43b4c3545065}"
    }
  }
}