Youtube, Firefox and rtsp

[chris_02]

Hey guys,

when I try to play youtube videos in Firefox, I get the following message:
====================

The address wasn't understood

Firefox doesn't know how to open this address, because one of the following protocols (rtsp) isn't associated with any program or is not allowed in this context.

You might need to install other software to open this address.
====================

Is there an easy quick fix for this?

Best,
Thomas

with the last image (15/06/20) there is no more problem reading youtube