Hangouts toggle is a accessibility chrome extension. it's a free extension , it has 75 active users since released its first version, it earns an average rating of 4.50 from 2 rated user, last update is 3010 days ago.
This extension allows you to (un)mute your microphone and enable/disable your webcam with a single shortcut from everywhere. You're able to select the shortcut from the Extensions page in Chrome, at the right bottom of the page.
You could download the latest version crx file or older version files and install it.
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100% user give 5-star rating. Read reviews of hangouts toggle
You could find more help information from hangouts toggle support page.
You could send emails to publisher, or check publisher's website.
More about manifest_file of hangouts toggle.
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This needs to be a feature in google hangouts.