Basilisk
A XUL-based web-browser demonstrating the Unified XUL Platform (UXP).
What is 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.
The browser is created and maintained by the team behind
Pale Moon , and is a fully independent fork of the 
Mozilla Firefox code.
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.
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.
The browser is created and maintained by the team behind
Pale Moon , and is a fully independent fork of the 
Mozilla Firefox code.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.
Recent user activities on Basilisk
- ivecoco added chromium-gost as an alternative to Basilisk
- schwarzmetal reviewed BasiliskInsecure, behind upstream, lack modern standards. Short: one of worst browser
- schwarzmetal thinks Microsoft Edge is an alternative to Basilisk
A very welcome option/alternative considering the questionable direction Mozilla Firefox is currently heading. From the same developers of Pale Moon, which I've been using since XP days, we can be assured this is a long term project.
I like Basilisk, because it is a not popular alternative browser that supports classic add-ons such as classic theme restorer and classic toolbar buttons. It is also moderately fast.
Insecure, behind upstream, lack modern standards.
Short: one of worst browser