Dead Embed & Script Finder: FB Like, Maps, polyfill.io, AddThis

Old websites are full of third-party embeds that quietly stopped working — or became dangerous. This Actor crawls your sites and finds them, page by page, with the fix for each:

What	Since	What visitors see	Source
Facebook Like button and Comments plugin	10 Feb 2026	invisible 0×0 box	Meta for Developers
Google Maps KmlLayer, Heatmap Layer, Drawing library	Apr / May 2026	map features missing	Google Maps deprecations
Google Maps loaded without an API key, or retired v2 / Fusion Tables loaders	2018–2021	"for development purposes only" or no map	Google
polyfill.io and its sister CDNs (bootcss, bootcdn, staticfile)	Jun 2024	supply-chain malware risk	Cloudflare
Old Square payment form (SqPaymentForm)	dead	checkout can't load	host checked 27 Oct 2026
Old Quantcast consent script (*.mgr.consensu.org)	dead	no consent banner	host checked 27 Oct 2026
Azure Media Player / Media Services streams, Azure Maps v1	2024	video / map broken	Microsoft
Universal Analytics, Google Optimize	2023	no data, slower pages	Google
Firebase Dynamic Links, Skype buttons, Stamen tiles, AddThis, Gfycat, Facebook Customer Chat, Livefyre, YUI CDN, Leaflet's old CDN, Mapbox v3 tiles, Instafeed	2023–2025	dead links, blank widgets, grey maps	vendors + hosts checked
Browser-side XSLT (XSLTProcessor), and XSL-styled sitemaps (info only)	17 Nov 2026 (Chrome 158)	XSLT content stops showing in Chrome	Chrome for Developers
Zoom Meeting SDK for Web below 4.0.0 (version shown; checked against Zoom's minimum-version table)	7 Nov 2026, then every quarter	attendees can't join embedded meetings	Zoom KB0061130
Twitch embeds without parent= (or not listing this host)	live requirement	playback error instead of the stream	Twitch
YouTube embeds on pages with Referrer-Policy: no-referrer / same-origin	live requirement (updated 15 Oct 2026)	player may show an error or lose features	YouTube
Bing Maps V8 web control	free keys already retired; Enterprise 30 Jun 2028	credentials error on the map	Microsoft Learn

Built for web agencies and maintainers (audit every client site before something visibly breaks), marketing teams (dead Like/Comments boxes and share bars) and security teams (polyfill.io-style supply-chain risk).

Input

{ "startUrls": ["https://www.example.org"], "maxPagesPerSite": 50, "maxDepth": 3, "useSitemap": true }

Or siteListUrl: a CSV/TXT or published Google Sheets CSV link with all your client sites. Each site is crawled on its own host, robots.txt is respected, sitemap pages are queued, and contact/map/shop/blog/event pages go first.

Output (one item per site)

{
  "site": "https://www.example.org",
  "risk": "high",
  "pagesCrawled": 50,
  "highFindings": 1,
  "mediumFindings": 2,
  "findings": [
    {"rule": "google-maps-removed-features", "severity": "high", "since": "2026-05-01",
     "title": "Uses Google Maps features that no longer exist (KmlLayer ...)", "pageCount": 3,
     "pages": ["https://www.example.org/locations", "..."], "action": "Replace KML layers with ...", "source": "https://developers.google.com/maps/deprecations"}
  ]
}

Pricing

Pay per page crawled. Pages that fail to load are free; the run stops at your spending limit.

FAQ

Why is my Facebook Like button not showing anymore? Meta discontinued the Like button and Comments plugin for third-party websites on 10 February 2026. Existing embeds now render as an invisible 0×0 box. This Actor lists every page that still carries them so you can remove them (the Share button and Page plugin still work).

Google Maps KmlLayer or heatmap stopped working on my site. Why? Google removed KmlLayer at the end of April 2026, and the Heatmap Layer and Drawing library in May 2026 (Google Maps Platform deprecations page). The Actor finds pages using them, plus maps loaded without an API key (the dark "for development purposes only" map) and the long-retired v2 / Fusion Tables loaders.

How do I check if my site still loads polyfill.io? Run the Actor on your domains: it flags <script> tags from polyfill.io and its sister CDNs (bootcss, bootcdn, staticfile) on every crawled page. Remove them or point them to a safe mirror.

Will Chrome's XSLT removal break my site? Chrome 158 turns XSLT off on 17 November 2026. Pages that render XML with XSLTProcessor or an XSL stylesheet are flagged as high; XSL-styled XML sitemaps are reported as info only, because search engines don't use the stylesheet.

Does it run JavaScript? No. It reads the HTML your server sends (including inline scripts), which is where these embeds and loaders live. That keeps it fast and cheap; widgets injected later by a tag manager may not show up.

More tools from the same author

• Website 2027 Breakage Audit: these checks on the home page plus certificates, Shopify, PayPal, Azure, Drupal and PHP deadlines, one report per site.
• PayPal Legacy Button Finder: old PayPal Buy Now / Add to Cart buttons across whole sites.
• SSL Root Certificate Distrust Checker: which sites break when Mozilla removes 19 roots on 15 April 2027.

Product names are trademarks of their owners. This Actor is independent and not affiliated with any of them.