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. You can still manually install 64-bit Firefox, if you choose.
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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). Download and Install Mozilla Firefox for Windows, Mac, Linux, and Mobile Devices This article provides instructions on how to install Mozilla Firefox on. URLs pasted into the download manager window are now automatically downloaded DEVELOPER - Support for the text-align-last CSS property has been added DEVELOPER - Experimental support for ECMAScript 6 Map and Set objects has. 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. NEW - Windows: Firefox is now easier to update with one less prompt (User Account. 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. Learn more about Firefox products that handle your data with respect and are built for privacy. 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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