Examine source code of Travel Tab Gallery

{
  "manifest_version": 2,
  "name": "Travel Tab Gallery",
  "version": "1.0",
  "description": "Display beautiful travel destination images on new tab.",
  "chrome_url_overrides": {
    "newtab": "tab.html"
  },
  "permissions": [],
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0122a8ec-b0c4-436a-8d56-1aee7879c4bd}"
    }
  }
}