Browse without compromise.
Umbra is a privacy-focused browser built on the latest Firefox engine. Hardened by default, extended with powerful privacy tools, and designed to respect your digital sovereignty.
Why Umbra?
Privacy Hardened
Maximum privacy settings, fingerprinting resistance (RFP), HTTPS-only mode, query stripping, and strict content blocking — all enabled by default.
Pre-loaded Extensions
uBlock Origin, AdNauseam, and TrackMeNot come pre-installed and ready. No setup required — your privacy starts on first launch.
Fast & Secure
Built on the latest Firefox ESR with additional security hardening: strict certificate pinning, CRLite, TLS 1.3 optimizations, and jemalloc memory allocator.
Clean Onboarding
A welcoming first-run experience that explains your privacy tools without getting in your way. No ads, no sponsored content, no telemetry.
Low Overhead
Disk cache disabled, session restore privacy-level max, autoplay blocked, speculation/prefetching off — your machine stays yours.
Fully Compatible
Runs all Firefox extensions and WebExtensions. Your favorite tools work here. Container tabs, password manager alternatives — all supported.
Get Started
Umbra is currently in development. Pre-built binaries will be available here once the first release is ready.
Linux
AppImage · tarball
Coming soonmacOS
Intel · Apple Silicon
Coming soonWindows
Installer · Portable
Coming soonUmbra is based on Umbra, which provides binaries for all platforms.