The chromium team is currently experimenting in Beta Channel with casting tabs without the Google Cast extension installed thanks to the new Media Router¹.

By simply enabling the experimental flag "Media Router" at chrome://flags/#media-router, the Google Cast extension will be disabled and you'll be able to right click on a page and see a new "Cast..." menu (also available in the Chrome menu and in the redesigned Extension Toolbar²).
Toggling off the flag will re-enable the Google Cast extension.


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