WebGL Player is stuck on loading when opening it in Firefox

Reproduction steps:
1. Open the attached “ASDQWE” project
2. In the top menu select File > Build And Run
3. Observe the Player in a browser

Expected result: The Player loads
Actual result: The Player is stuck on loading

Reproducible with: 2021.3.24f1, 2022.2.17f1, 2023.1.0a19, 2023.2.0a5
Fixed in: 2023.1.0a20, 2023.2.0a6
Could not test with: 2020.3.47f1 “An error occurred running the Unity content on this page” error is thrown in the browser

Reproducible on: Intel MacOS 13.3.1