Steam Audio website is sending invalid responses. Same for all pages under valvesoftware.github.io on Firefox

[feenix1]

System Information
Please provide the following information about your system:

• Steam Audio version: N/A
• (If applicable) Unity version: N/A
• (If applicable) Unreal Engine version: N/A
• (If applicable) FMOD Studio version: N/A
• Operating System and version: Windows 10 22H2
• (Optional) CPU architecture (e.g. x86-64, armv7): x86-64

Issue Description
Describe what you expected should happen and what did happen. Please link any large code pastes as a Github Gist

Visited website. Expected to see homepage. Got a SSL_ERROR_RX_RECORD_TOO_LONG error on Firefox, and was blocked by my ISP when using http. Was able to visit website on Chrome, but would also occasionally get the same/similar error.

Steps To Reproduce
Steps to reproduce the behavior:

1. Go to the Steam Audio GitHub Pages using Firefox.

If you are able to provide a minimal project or minimal source code that reproduces the issue, include a link to the project/code here.

Crash Dump
If the issue you are reporting involves a crash, and a crash dump (e.g. .dmp file) is available, provide a link to it here.