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Re:Mozilla brings back 64-bit builds of Firefox for Windows by keeperofdakeys on Friday December 21, 2012 @09:17PM (#4955518)
From what I have read, it is lack of a maintainer since the current developers are concentrating on other features. The 64-bit support problem is also only on Windows, and one of the dis-incentives is lack a of 64-bit plugins.
Re:Mozilla brings back 64-bit builds of Firefox for Windows by marshray on Friday December 21, 2012 @09:55PM (#4955594)
Lack of plugins is a benefit in my world! :-)

Seriously, there are other tangible security benefits to 64 bits as well. For example, ASLR is going to have more bits with which to randomize DLL base addresses.