http://www.cbtnuggets.com/it-training-videos/course/cisco-troubleshooting can not watch error loading media file could not be played
Eminye Imininingwane Yohlelo
- I-ejenti Engumsebenzisi: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:25.0) Gecko/20100101 Firefox/25.0
The site you have linked uses Adobe Flash player for it's videos, which is not currently supported by Firefox OS.
YouTube I can watch. It based on flash too
YouTube will also work using HTML5, which Firefox OS supports, so you don't need Flash for that content.
cbtnuggets using jw player. The browser in computer able to watch. I think there the same solution as Firefox browser.
I found the following, in case it helps: