Examine source code of Bookmarks Dashboard

{
  "manifest_version": 2,
  "name": "Bookmarks Dashboard",
  "version": "1.2",
  "description": "A custom dashboard for Firefox bookmarks",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "permissions": [
    "bookmarks",
    "storage",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "vuorre@gmail.com"
    }
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  }
}