Fix Firefox Not Responding Due to High Memory Usage - Fix Windows Defender Dependency Conflict on Windows 10/11-OneDrive Error 0x8004deb4: Sync Won't Start

Updated 2026-06-14 21:10:45backup-recovery
Fix Firefox Not Responding Due to High Memory Usage - Fix Windows Defender Dependency Conflict on Windows 10/11-OneDrive Error 0x8004deb4: Sync Won't Start
Before changing system settings, save your work and note the exact error text so you can compare results after each step.

Extra verification checklist

  • Restart the affected app after changing permissions or configuration files.
  • Test the same workflow in a clean browser profile or a temporary user account.
  • Compare the result on another network if the error may be connection related.