- Mar 18, 2007
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Once you install 64-bit Firefox—assuming you are also running a 64-bit version of Windows—it will be hard to tell the difference between it and the 32-bit version. Most of the big improvements happen behind the scenes, although the 64-bit version should be able to keep more tabs open without slowing as well as run web apps that require 64-bit support. 64-bit programs are able to address more than 4GB of memory, allowing for better performance.
Is there any compatibility issue with addons for the x64 version?
Also, is there a way to upgrade the 32 bit standard ver. to the x64?
Addons are not affected because they use architecture agnostic features like javascript. Plugins may be affected but Firefox is eventually getting rid of all NPAPI plugins save for Flash so that's not really a big deal.
If you install the 64-bit version it will replace the 32-bit icons on your desktop and will use the same browser profile. You can also uninstall the 32-bit version without deleting your profile and then install the 64-bit version. They both use the same profile so you can freely switch between them.

 
				
		