Its path to a 64-bit Firefox for Windows has been contorted. Mozilla was the last holdout among the top five browser builders. Opera Software, the Norwegian browser maker known for its same-named desktop flagship, also offers a 64-bit edition on Windows. Google, for example, shipped a Windows 64-bit Chrome in August 2014 and one for OS X in November of that year, while Apple's Safari and Microsoft's Internet Explorer (IE) have had 64-bit editions on OS X and Windows since 20, respectively. The appearance today of the Firefox 43 ends Mozilla's climb to catch up with rivals, who had offered 64-bit browsers long before, in some instances years. If you need to run 32-bit Firefox or manually install 64-bit Firefox, you can simply download and re-run the Windows (32-bit or 64-bit) Firefox installer from the Firefox platforms and languages download page.The biggest advantage of a 64-bit browser on a 64-bit operating system - like Windows and Apple's OS X - is that it can address more than the 4GB of memory available to a 32-bit application, letting users keep open hundreds of tabs, and run larger, more sophisticated Web apps, notably games. You can still manually install 64-bit Firefox, if you choose. If you see “(32-bit)” and are running Firefox 56.0.1 or newer, then your computer may not meet the minimum memory requirement for 64-bit (3 GB RAM or more).If you see “(32-bit)” and you are running Firefox 56.0 or older, updating to the latest Firefox version should automatically upgrade you to 64-bit.Check your Firefox version (in the “About Firefox” window) and look for “(32-bit)” or “(64-bit)” after the version number: If you’re running 64-bit Windows ( here’s how to check), your Firefox may already be 64-bit.

Linux and macOS users, fret not, you already enjoy a Firefox that’s optimized for 64-bit.

Also, with the jump from 32 to 64 bits, a security feature called Address Space Layout Randomization (ASLR) works better to protect you from attackers. Here’s the key thing to know: 64-bit applications can access more memory and are less likely to crash than 32-bit applications. What’s the difference between 32-bit and 64-bit?

How much less? In our tests so far, 64-bit Firefox reduced crashes by 39% on machines with 4GB of RAM or more. That means you get a more secure version of Firefox, one that also crashes a whole lot less. Users on 64-bit Windows who download Firefox can get our 64-bit version by default.

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