Thanks for reporting this problem, @kevaryza.
KA Lite (“Virtual School”) requires the H.264 codecs to play videos, and unless you purchase Endless hardware (for which Endless pays the codecs license fee) or purchase the codecs from our online store, you will not be able to play H.264 videos in Chromium. The codecs issue is why we now try to automatically download and set Google Chrome as the default browser for anyone who downloads Endless or purchases a computer that runs Endless from an OEM like ASUS or Acer. (Google covers codecs licenses when Chrome is downloaded from their servers.)
My expectation was that once a user had set Google Chrome as the default browser (either manually or as part of this automatic download/install), KA Lite would open in the default browser. But, as you found (and I was able to reproduce), that is not the case. I’ll open a bug report for my team to work on this. (I also found the same problem with webapps like Facebook and Whatsapp.) Most likely too late for us to address for the 3.1.3 release, but hopefully we’ll have a fix soon. In the meantime, that’s a great idea to add a weblink to the desktop.
For anyone else who needs to do this, please following the instructions below…