Examine source code of hexagonTab

{
  "name": "hexagonTab",
  "short_name": "hexagonTab",
  "description": "Hexagon bookmarks accented with a chosen colour. Customise the layout, style and background with hexagonTab.",
  "version": "4.1.0",
  "manifest_version": 2,
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "icons": {
    "16": "icon/icon-16.png",
    "48": "icon/icon-48.png",
    "128": "icon/icon-128.png",
    "512": "icon/icon-512.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{92625afd-15f3-4593-8dcf-b99ebe237c90}"
    }
  }
}