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Mozilla has joined the 64-bit browsing party with Firefox for Windows, but only in the Developer Edition for now.

The Developer Edition is a special version of Firefox with built-in tools for creating websites and web apps. While OS X and Linux already have a 64-bit version, Mozilla is just adding a Windows build with 64-bit support now.

The main advantage of 64-bit browsing is the ability to address more than 4 GB of RAM, allowing for beefier web apps. As an example, Mozilla points to games that run on Epic's Unreal Engine, noting that a 64-bit browser can store significantly more assets in memory. “For some of the largest of these apps, a 64-bit browser means the difference between whether or not a game will run,” Mozilla wrote in a blog post.