64 bit is better suited for advanced users & nerds at the moment. :) If you're not very computer savvy, just stick with 32 bit. Two articles about the theories/claims of 64-bit vs. So something to think about before switching.
And other plugins like VLC media player won't work with 64-bit Firefox because they haven't been whitelisted. Also 64 bit plugins for Java, Silverlight and a few others won't work because they're being blocked for security & stability reasons. If you don't use Firefox in that way, you won't notice much difference. But if your Firefox is using 4GB of memory, you're already in big trouble. :P The 64 bit version is able to use more memory (over 4GB) past the 32 bit limitation of 4GB. One difference to note though is if you use Firefox in a very heavy way with 100s of tabs and you notice high memory issues. 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.It does not make any difference at the moment. 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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