Waterfoxis a project designed by Mozilla based on Firefox. The browser’s developers modified the Firefox source code specifically for machines running 64-bit versions of Windows. Software designed for 64-bit Windows editions can take advantage of faster RAM and processing speeds and greater stability in 64-bit systems. Just converting Mozilla’s source code for 64-bit Windows doesn’t do enough to make Waterfox stand apart from Firefox and other Firefox-based Web browsers; other unique tweaks help it exploit the speed of 64-bit systems. As the Waterfox Web site states, speed is its mission.
Mozilla still hasn’t officially released any 64-bit builds for Firefox, and Waterfox aims to fill that void. It has one main goal: speed. They’ve tweaked a lot of Firefox’s codebase to work better with 64-bit processors, so if you’re running a 64-bit version of Windows, it should give you a solid speed boost. It also updates whenever Firefox does, so you’re never behind, and uses your current Firefox profile, so you don’t have to do any extra setup. All of your add-ons should work out of the box, too.
If you don’t like Waterfox for any reason, you might also check out Pale Moon another Windows-optimized Firefox build. It updates a bit less quickly than Waterfox, and lots of users find Waterfox to be faster, but Pale Moon also has a few other UI tweaks. Hit the link to check out Waterfox.