HTML5 Developer Notice is a html5 extension for chrome. it's a free extension , it has 8 active users since released its first version, it earns an average rating of 5.00 from 1 rated user, last update is 4083 days ago.
This is just an extension to make the chrome browser friendly to me, please do not download or use, it is just a simple test.
You could download the latest version crx file or older version files and install it.
English.
You could find more help information from html5 developer notice support page.
You could send emails to publisher, or check publisher's website.
More about manifest_file of html5 developer notice.
You could click to report abuse of html5 developer notice.