CoursesPlus
CoursesPlus is an extension that makes Dalton Courses awesome.
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for Google Chrome
Screenshots Changelog Public Beta Archived Versions Features Chrome Web Store page
Make it yours
Hundreds of different customization options allow you to tweak and change every aspect of Courses how you want.
Services
Check the weather, check your schedule, check what's for lunch.
Image is from Wikimedia Commons.
Add a background
It can be a GIF or just a normal picture