Viewing screen share in Firefox never works without refresh

Joining any screen share in Firefox using only bare minimum extensions (Ublock Origin / Dark Reader) always requires a refresh before the stream will load. If you do not refresh, the purple cubes will spin forever. This happens every time a new screen share is opened, and anytime a screen share disconnects for any reason.

This is not an internet issue, I tested using the same Internet connection on the Android app, and there are no problems. Purely a web app issue.

Expected behavior:

Not requiring a refresh every time

Steps to recreate:

1. Join a voice chat with Firefox with Ublock Origin / Dark Reader installed

2. Have another user on Discord desktop hit "Share Screen"

3. Hover over the other Discord user and click "watch stream"

The purple blocks will spin forever until the tab is refreshed.