GTM Debug Down is a tag manager extension for chrome. it's a free extension and is featured in Developer Tools, it has 34 active users since released its first version, it earns an average rating of 5.00 from 1 rated user, last update is 2118 days ago.
If you're like me, sometimes I need to preview Google Tag Manager (GTM) changes without the debug pane being visible. Hopefully this will help you like it helped me...
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 gtm debug down support page.
You could send emails to publisher, or check publisher's website.
More about manifest_file of gtm debug down.
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