FoxFlow от Wakapedia

Features:
• Smart file routing - Downloads are automatically sorted into folders based on file extension (jpg → Images/, mp4 → Videos/, etc.)
• Quick setup presets - One-click configuration for common file types: Images, Videos, Audio, Documents, Archives, Code, Books, and more
• Fully customizable - Create your own folder mappings for any file extension
• Domain bypass list - Exclude specific websites from automatic organization
• Zero configuration required - Works immediately with sensible defaults
• Privacy focused - No data collection, everything stays local

Note: Folders created from this addon can only be made in the default Firefox downloads directory that you set and does not have access to any folders outside of this.