Update on Hangout Toolbox
It took a while, but eventually the Google engineers found a way to publish the Hangout Toolbox again. The app should now show up as a featured app again when in a Hangout On Air.

The extension should be available to everyone again starting today including the latest version with Material Design.

Please be aware that the app will still go away eventually in the long run as the API was deprecated.

Enjoy it while it's back again :-)

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