Duolingo Clean Themes is a dark mode extension for chrome. it's a free extension , it has 168 active users since released its first version, it earns an average rating of 5.00 from 2 rated user, last update is 761 days ago.
A dark theme for Duolingo with cleaned up UI and restored Stories tab
You could download the latest version crx file or older version files and install it.
English (UK).
You could find more help information from duolingo clean themes support page.
You could send emails to publisher, or check publisher's website.
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