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](https://support.apple.com/en-il/guide/mac-help/mh32356) settings, firefox is missing.

i tried [this answer](https://apple.stackexchange.com/a/384318/337426) and [this](https://apple.stackexchange.com/a/384311/337426) then openned firefox and navigated to a website that [prompted for using the cam and mic](https://support.mozilla.org/en-US/kb/how-manage-your-camera-and-microphone-permissions). 

[![firefox perms propmt][1]][1]

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)


  [1]: https://i.sstatic.net/m5wl9.png