Recently I have started seeing cast_sender.js console errors in one of the websites.
Issue here was It’s the JavaScript code inside the YouTube iframe polls for the extensions it could interoperate with in case they were installed (likely to determine if the extension is installed).
A simple solution – To stop seeing those cast_sender.js errors, edit the youtube link in the iframe src and change embedto v
E.g. If you have a link ” https://www.youtube.com/embed/pw6wBn1pgA8 ” Just replace to look like ” https://www.youtube.com/v/pw6wBn1pgA8 “
