hypnosec (2231454) writes "Plans for 64-bit Firefox for Windows have been put on hold by Mozilla in a bid to concentrate more on the 32-bit versions it has been found. The proposal of striking off the 64-bit nightly builds was put forward by Benjamin Smedberg, a Firefox developer, last week. Some of the reason that Smedberg cited for constant frustration include missing plugins for 64-bit version; lack of windowproc hooking which facilitates smooth functioning of whatever plugins are available; and inability to work on the crash reports submitted for the 64-bit versions because they were not on high priority. The proposal, it seems, has been accepted as is evident from this bug report."
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