firefox and webrtc, no audio

[cerien]

Hello
I am running a 3cx v20 hosted locally. It has an outgoing trunk to a sip provider. Calls via the 3CX app work just fine. If I use firefox (in my lan) and connect to my 3CX (via FQDN that eventually lands on the same lan), I get no audio. On the same PC, using Chrome or Brave, everything works fine. Firefox has the mic allowed for the site, and the connection is in HTTPS.

The firefox console displays: Content-Security-Policy: The page’s settings blocked the loading of a resource at eval (“script-src”).

The error is not happening with Chrome - Could this be the cause - otherwise, why would there be no audio ?

Rgds,
J.