Waterfox

Waterfox (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. Waterfox was the first community Firefox builds to release a 64-Bit version of Firefox 4 when it first came out.
When we first opened Waterfox, it displayed our bookmarks and other personal data from Firefox. When it comes to looks and extras, Waterfox doesn't disappoint in a side-by-side comparison with the latest Firefox release. Waterfox has a family resemblance to other Mozilla-based browsers, with a dark blue Start button instead of Firefox's orange. Otherwise, Waterfox looks and functions like Firefox, including its various customizable features and options. Our add-ons, extensions, and plug-ins worked in Waterfox, too, including Microsoft's Office and Silverlight plug-ins. Waterfox also has regular updates.
We could tell with just a few quick trips to familiar sites that Waterfox is fast, so we visited some of our favorite browser speed test sites to see how it stacks up against the competition, including Firefox and our current default, Chrome. For the most revealing results, we threw Peacekeeper's HTML5 torture test at each, pitting Waterfox against the site's Chrome benchmark and our own copy of Chrome.