Examine source code of Google Keyboard Search

{
  "manifest_version": 2,
  "name": "Google Keyboard Search",
  "version": "1.0.1",
  "icons": {
    "64": "icons/icon.png"
  },
  "description": "Search selected text on Google using a keyboard shortcut. ",
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "commands": {
    "search-google": {
      "suggested_key": {
        "default": "Ctrl+Shift+I",
        "mac": "Command+Shift+I"
      },
      "description": "Search selected text on Google"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "contentScript.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "quick-google-search@yourdomain.com",
      "strict_min_version": "126.0"
    }
  }
}