Basilisk is a free and Open Source XUL-based web browser, featuring the well-known Firefox-style interface and operation. It is based on the Goanna layout and rendering engine (a fork of Gecko) and builds on the Unified XUL Platform (UXP), which in turn is a fork of the Mozilla code base without Servo or Rust.
Support for all NPAPI plugins (Unity, Silverlight, Flash, Java, authentication plugins, etc.).
Support for XUL/Overlay Mozilla-style extensions.
Experimental support for WebExtensions (in gecko-target mode). Please note that some Mozilla-specific WebExtension APIs are not yet available.
Support for ALSA on Linux.
Support for WebAssembly (WASM).
Support for advanced Graphite font shaping features.
Support for modern web cryptography: up to TLS 1.3, modern ciphers, HSTS, etc.