Talk visio doen't work anymore

On my server, all work fine. I can chat with other nexctloud user with talk app on mobile or firefox.
all worked fine but this last days … i don’t no why, visioconference doesn’t work anymore juste with firefox. if I try to test coturn service, the circle don’t stop to turn like if coturn doesn’t work anymore too…
I try with app and all works fine and I try with chromium browser and the coturn test and videoconference all work fine. I’m looking for the firefox problem but I can"t find a solution …

I tried to disable ublock origin extension, I tyr too change firefox config for this variable :

but always the same problem

can you help me please ?