Mozilla quietly ceases Firefox 64-bit development
Found on CNet News on Thursday, 22 November 2012

Claiming that 64-bit Firefox is a "constant source of misunderstanding and frustration," the engineer wrote that the builds often crash, many plugins are not available in 64-bit versions, and hangs are more common due to a lack of coding which causes plugins to function incorrectly.
"Thank you to everyone who participated in this thread. Given the existing information, I have decided to proceed with disabling windows 64-bit nightly and hourly builds. Please let us consider this discussion closed unless there is critical new information which needs to be presented."
So because they cannot fix the bugs, they stop releasing the builds? I have to admit that this is one way to deal with a problem; not the most intelligent one though.