No video using macos 10.14.6

hi, new here.
I am using a Macbook (early 2016) running macos 10.14.6.
I have just registered for jitsi and opened a video conference room as a test. I have enabled the mic and camera on the Macbook. The camera is working (I opened Facetime and I can see myself). But I can’t get the video to work on the jitsi website.
This is what I see:

FireShot Capture 003 - Jitsi Meet - meet.jit.si.png
Thanks in advance for all assistance.

Which browser are you using? Does appr.tc work for you?

Boris

the latest Firfox. I will try on chrome and get back to you

hi
I am not sitting at a late 2012 iMac running macos 10.14.6. Both Firefox and chrome work appr.tc works with both. On the macbook, chrome works but Firefox still doesnt.
Probably not worth spending too much time on this issue, chrome works on both 'puters.