How does Firefox blocks you screen sharing? Is there any error info or behavior? Also, are you sharing the Firefox window or other windows behind it?

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Product: Firefox Topic: Device permissions System Details:

   Mac OS x 10.15
   Firefox 144.0

I copy it here because I previously ignored it

I'm trying to complete a job whereby I have to share my screen for recording and for some reason it is not working and won't allow me to do it. I have gone to privacy and security settings in mozilla and i can see camera and microphone but not for screen sharing

without a clearer understanding of the problem, there's not much i can do to help...

is the website or an app requesting a screen share? which step does it fail (no permission popup / window selection failed or?)

also, if you want to test it, you can go WebRTC Experiment (Source)

Yes the website is requesting a screenshare and I select the page which I wish to share and it simply doesn't allow.

I have gone to privacy and security settings in Mozilla Firefox but there is no option to "share screen" . I have allowed Microphone and video

Since you are using Mac OS:

System Settings -> Privacy and Security -> Screen and System Audio Recording -> Add Firefox to the list and toggle it on.