I previously showed how to deploy Chrome with group policy (GPO) and I felt bad about it... To repair this infamy I will show how to do the same but with Mozilla Firefox.
I made it works for Workstations and for Users who doesn't have Administrator rights.
As for Chrome it didn't work and I could see the same list of errors inside Event Viewer
Thanks to https://serverfault.com/ I could solve it :
Reboot and ...
Now you must just feel better with yourself...