Examine source code of Oxygen

{
  "manifest_version": 2,
  "name": "Oxygen",
  "version": "1.0",
  "description": "Breathe life into your new tab screen with oxygen.",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_action": {
    "default_icon": "favicon.ico",
    "default_title": "Oxygen"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1523483b-b4f4-4d16-adbd-0d2fffeca863}"
    }
  }
}