Zen is a Firefox-based browser designed for productivity and privacy. It features a calmer, distraction-free interface with modern productivity tools including workspaces, vertical tabs, split view, and compact mode.

Key capabilities:
- Workspaces - Organize tabs by project or topic
- Split View - Tiled interface for viewing multiple tabs
- Glance - Modal preview for quick link viewing
- Compact Mode - Auto-hiding sidebar for more screen space
- Privacy-focused - Telemetry completely stripped, no tracking
- Customizable - Live CSS editing and community Zen Mods
- Firefox Sync support - Cross-device synchronization
- Full add-on compatibility - Works with all Firefox extensions