Hi ulfr
In firefox, click Tools->Add-ons and Themes
Select Plugins
You should see these 2:
OpenH264 Video Codec provided by Cisco Systems, Inc.
Widevine Content Decryption Module provided by Google Inc.
Make sure they're enabled.
I've attached files that list which libraries firefox is using
in TC10 32 bit and TC14 64 bit.
To see which libraries firefox is using on your system, install
lsof.tcz and run:
lsof -c firefox-bin | grep "\.so" | cut -d '/' -f2- | sort > firefoxlibs.txt