The fastest 64-Bit variant of Firefox
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.