Examine source code of TabPage

{
  "manifest_version": 2,
  "name": "TabPage",
  "version": "1.1resigned1",
  "description": "Changes the New Tab page to a page with date and time",
  "icons": {
    "48": "icons/48.png"
  },
  "chrome_settings_overrides": {
    "homepage": "index.html"
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2b31c27e-fd31-4f1a-812e-24334b09529c}"
    }
  }
}