This is the Software Publisher's description.
Why settle for a basic build of your Firefox browser on Windows Operating Systems when you can have one that is specifically made for getting the most out of your system? Mozilla does not provide optimized browser packages for Windows, meaning you may be losing speed and efficiency when you use your browser; and truth be told, most people use their browsers all the time! That needs to change, so, here is the Pale Moon project: Custom-built and optimized Firefox browsers for Windows Operating Systems. Make sure to get the most speed and efficiency out of your browser.
Of course, getting a more efficient browser is not just about optimizing the compilation process (building a program from its source code), but also about carefully choosing features and knowing how to choose the best setup. This means that this browser, however extremely close to Firefox in the way it works, does not have all the functions that Firefox has. A few, carefully selected, features have been disabled that are not in high demand, and that do not interfere with the way web pages are displayed or function; all to maximize speed and efficiency of the browser.
Contrary to what Mozilla has done with their redesign of the user interface, Pale Moon will continue to provide a familiar set of controls and visual feedback similar to previous versions, including grouped navigation buttons of a decent size, a bookmarks toolbar that is enabled by default, and not in the least a functional status bar.
Note that his is the x64 optimised version of Pale Moon, based on Firefox 20.