Examine source code of New Tab Enhanced

{
  "applications": {
    "gecko": {
      "id": "enhanced-new-tab@isaac-newt.com",
      "strict_min_version": "54.0"
    }
  },
  "manifest_version": 2,
  "name": "New Tab Enhanced",
  "version": "1.4.2resigned1",
  "description": "A better new tab experience",
  "icons": {
    "48": "new-tab-enhanced.png"
  },
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "storage",
    "identity",
    "topSites",
    "bookmarks"
  ],
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  }
}