Waterfox is a Firefox-based browser especially designed for 64-bit operating systems. Waterfox uses the same profile that Firefox does. If you uninstall Waterfox make sure you don't have the remove personal data box ticked!
Waterfox is basically a 64-Bit version of Firefox. The Firefox source code is taken and compiled to run specifically for 64-Bit Windows computers. To make Waterfox stand out a bit more, it’s compiled with optimizations so that it will run more efficiently and faster than just compiling Firefox as a 64-Bit program.

What's New in This Release:
· Support for SPDY networking protocol v3
· WebGL enhancements, including compressed textures for better performance
· Optimized memory usage for add-ons
· JavaScript debugger integrated into developer tools
· New layout view added to Inspector
· High precision event timer implemented
· The CSS word-break property has been implemented.
· New responsive design tool allows web developers to switch between desktop and mobile views of sites
· Native support for the Opus audio codec added
· The and elements now support the played attribute
· The element now supports the media attribute
· Focus rings keep growing when repeatedly tabbing through elements (720987)
· Fixed any remaining installer issues
· Added optional portable version (useful for users without administrator permissions)
· Optional AVG Security Search