[Support Request] SOURCE_ERROR 1200 on Firefox 137 (Windows Only)

Hi Bitmovin Support Team,

We’ve encountered a platform-specific issue with Bitmovin Player where playback fails only on Firefox 137 on Windows.

When attempting to play a DASH stream with Widevine DRM, the player throws the following error:

Additional context:

  • Playback works fine on Chrome, Edge, and Safari
  • Firefox Private Browsing mode works fine
  • The issue only happens on Firefox 137 in normal mode on Windows
  • We’re currently using Bitmovin Player version 8.169.0

Could you please advise if this is a known issue or potentially related to recent changes in Firefox or Bitmovin? Is there any recommended workaround or upcoming fix?

Thank you in advance!

Best regards,
Nick