Examine source code of Google Rich Snippets

{
  "manifest_version": 2,
  "name": "Google Rich Snippets",
  "version": "1.0",
  "description": "Highlight Google Rich Snippets on the current webpage.",
  "permissions": [
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "google_rich_snippets_extension@gmail.com"
    }
  }
}