MasterClass LeanBack is a productivity chrome extension. it's a free extension and is featured in Productivity, it has 36 active users since released its first version, it earns an average rating of 1.00 from 1 rated user, last update is 1758 days ago.
This is no longer required as MasterClass.com have now implemented auto-play natively on the site :)
You could download the latest version crx file or older version files and install it.
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You could find more help information from masterclass leanback support page.
You could send emails to publisher, or check publisher's website.
More about manifest_file of masterclass leanback.
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