Chrome YouTube Cast_sender.js (www-embed-player.js)

Problem:

Failed to load resource: net::ERR_FAILED chrome-extension://enhhojjnijigcajfphajepfemndkmdlo/cast_sender.js

Failed to load resource: net::ERR_FAILED chrome-extension://hfaagokkkhdbgiakmmlclaapfelnkoah/cast_sender.js

Failed to load resource: net::ERR_FAILED chrome-extension://enhhojjnijigcajfphajepfemndkmdlo/cast_sender.js

Failed to load resource: net::ERR_FAILED chrome-extension://fmfcbgogabcbclcofgocippekhfcmgfj/cast_sender.js

Failed to load resource: net::ERR_FAILED

Solution:

The only solution I've come across is to install the Google Cast extension, whether you need it or not. You may then hide the toolbar button.

For more information and updates, see this SO question.

Reason:

Apparently YouTube constantly polls for Google Cast scripts even if the extension isn't installed.

From one commenter:

... it appears that Chrome attempts to get cast_sender.js on pages that have YouTube content. I'm guessing when Chrome sees media that it can stream it attempts to access the Chromecast extension. When the extension isn't present, the error is thrown.

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