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If you are on a Remote Desktop Connection (RDP) on Windows, audio playback will be disabled due to increased security restrictions. This is a known issue since Firefox version 56 that we are working hard to fix.

In the meantime, you can reduce the sandbox security level by following these steps:

Warning: Changing advanced preferences can affect Firefox's stability and security. This is recommended for advanced users only.

Type about:config in the address bar and press EnterReturn.
A warning page may appear. Click Accept the Risk and Continue to go to the about:config page.
Search for the security.sandbox.content.level preference.
Click the Edit button next to the preference and set its value to 2.
Click on the checkmark to save the change.
Restart Firefox on the remote device.