253 Like Pale Moon Pale Moon is an Open Source, Goanna-based web browser available for Microsoft Windows and Linux focusing on efficiency and ease of use. Free Open Source Windows Linux Android Extensible by Plugins/Extensions Legacy addons support Portable Lightweight Plugin support Support for Firefox extensions Based on Firefox Optimized for Windows Based on Goanna engine Optimized Firefox
168 Like SeaMonkey the seamonkey project is a community effort to develop the seamonkey all-in-one internet application suite. a lighter alternative to mozilla firefox. Free Open Source Mac OS X Windows Linux BSD Extensible by Plugins/Extensions Portable Built in RSS reader WYSIWYG Support Integrated Email Client Support for Firefox extensions Modular System
7 Like Basilisk Basilisk is a free and Open Source XUL-based web browser, featuring the well-known Firefox-style interface and operation. Free Open Source Windows Linux Extensible by Plugins/Extensions Legacy addons support Tabbed browsing Support for WebExtensions Support for Firefox extensions Based on Firefox