32-bit / 64-bit has nothing to do with 128-bit encryption which Firefox has been capable of for over 10 years now.

''SearchingRoger [[#question-1218620|said]]'' <blockquote> Is a version of Firefox available for an iMac that supports 128-bit encryption? I can find only 64-bit Firefox. </blockquote> The 128-bit refers the encryption strength as the 32-bit and 64-bit is the OS or Operating System whether Windows, Mac OSX or Linux. Web browsers like Firefox used to have a '''U''' in the useragents to show it supported 128-bit encryption up till 2011. It was [https://hacks.mozilla.org/2010/09/final-user-agent-string-for-firefox-4/ removed from UA as of Firefox 4.0 Release] due to being a very outdated practice as Firefox supported 128-bit encryption for a very long time and Firefox even supports 256-bit encryption if the web site provides support for it. https://www.fortify.net/sslcheck.html

James, Thank you. SearchingRoger