In case you face issues while setting up proctoring on Firefox please follow these steps:
Step 5 - Enable screen sharing access. Ensure to Select Entire Screen.
Step 1 - Click on the pad lock icon
Step 2 - Change the default settings of Camera and Microphone to "Allow" (Refer the images below)
Click on More Information:
Click on Permissions tab and Allow using Camera and Microphone:
Step 3 - Go back to your assessment link and refresh the browser to reload the changed setting
Step 4 - Proceed to enable Camera and microphone access
Once you click on that, you will get below prompt:
Please share your entire screen, then click on the middle red box, and then share.