Download it new edition of Waterfox browser the alternative Firefox that runs on 64bit!! According to Waterfox it is a very fast browser, Try its alternative 64-Bit version Firefox!
Waterfox Installer
27.0.2
Language: English (U.S.)
Operating System: Windows Vista (x64) Windows 7 (x64), Windows 8 (x64)
Waterfox Portable
27.0.2
Language: English (U.S.)
Operating System: Windows XP (x64), Windows Vista (x64), Windows 7 (x64), Windows 8 (x64)