Virtual camera not showing up anymore in pull down menu after latest update

Hi there, I am using firefox for a long time in a pleasant manner for all web activty. Recently I have updated to V87.0 and ever since that moment I cannot select OBS virtual camera anymore in the camera drop down choice menu if I wish to mix this virtual cam into a video conference. It simply does not show the obs camera and the obs virtual camera in the drop down list anymore. In MS teams I can select OBS virtual camera and when using Edge for example it does work fine just as it previously did in FF as well. I hope someone can relate and solve this Kind regards Bart