Basilisk

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.

Basilisk as an application is primarily a vessel for development of the XUL platform it builds upon, and additionally a potential replacement for Firefox to retain the use of Firefox Extensions.

Basilisk is a modern, full-featured web browser. It aims to retain useful technologies that its sibling Firefox has removed.

Main features:

Full support for JavaScript's ECMAscript 6 standard for modern web browsing. Support for all NPAPI plugins (Unity, 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.

Windows requirements:

Windows 7 or later. 1GB of RAM (2GB or more recommended for heavy use). Dedicated GPU strongly recommended.

Linux requirements:

A reasonably modern Linux distribution. This browser may not work well on old or LTS releases of Linux. Release builds are compiled on Ubuntu 18.04. 1GB of RAM (2GB or more recommended for heavy use). Dedicated GPU and hardware accelerated video in X strongly recommended. GTK 2.24 or GTK 3.22+ (Not GTK 4) GLib 2.22 or higher. Pango 1.14 or higher. X.Org 1.0 or higher (1.7 or higher is recommended). libstdc++ 4.6.1 or higher.