Basilisk is a free and open-source web browser available for Windows, Linux, and with experimental support for FreeBSD and macOS.

Straver, as a fork of Mozilla Firefox in order to serve as a basis for the Unified XUL Platform,[4] with the developer calling it a "reference application for development of the XUL platform.

The browser supports modern web browsing, including support for ECMAScript 6 on release and modern web cryptography standards, NPAPI plugins, classic Firefox addons, ALSA on Linux, WebAssembly (WASM), and allows for unsigned extensions.

[9] The browser has been noted as lightweight, as it only requires 1 GB of RAM as a baseline.

[5] It's Foss stated that it is "a great option for users who want the classic look and feel of Mozilla’s Firefox (before the Quantum update) without comprising[sic] on the modern web support," but noted that some sites such as YouTube detected it as an obsolete browser and that "you should not rely on it as the only browser to use.