i have installed fiewfox (version 90.0.2) on macos version 11.5.1. in the camera and microphone under the privacy tab in security and privacy settings, firefox is missing.

i tried this answer and this then openned firefox and navigated to a website that prompted for using the cam and mic.

yet, when i approved it on firefox, the mac privacy dialog did not pop.

how can i give permissions to firefox for microphone and camera to be able to use them in firefox?

(my System Integrity Protection status is enabled)