Web Player with UnityWebRequest fails to load on Firefox browser when Compression Format is set to Brotli

Steps to reproduce:

1. Open the attached project “WebApiTest.zip” in VisualStudio (Open "WebApiTest.sln")
2. Run the project (Browser window should open and print "Hello1<...>Hello10")
3. Open the attached Unity project “FireFoxErrors.zip"
4. Switch to the WebGL platform
5. Build and Run on the Firefox browser

Expected result: The web player is successfully launched in the browser
Actual result: The web player is not loading up, and an error message is thrown:

TypeError: e is undefined
createUnityInstance/l/</<@http://localhost:50174/Build/Test1.loader.js:1:5768
promise callback*createUnityInstance/l/<@http://localhost:50174/Build/Test1.loader.js:1:5745 

Reproducible with: 2021.2.0b2, 2021.3.12f1, 2022.1.21f1, 2022.2.0b12, 2023.1.0a16
Not reproducible with: 2020.3.41f1, 2021.1.26f1, 2021.1.28f1
Could not test with: 2021.2.0a21, 2021.2.0b1 - due to errors when building:

Building Library/Bee/artifacts/WebGL/il2cpp/master_WebGL_wasm/wcpu_Interop.o failed with output:
/bin/sh: /usr/bin/python: No such file or directory

Notes:

• The issue is not reproducible on Google Chrome, Safari
• The issue is not reproducible if Compression Format is set to Disabled or Gzip
• Tested and reproduced with Firefox 106.0.1 (64-bit) on Windows 11 and MacOS version: 12.6