Andre Yoskowitz
23 Nov 2012 1:44
Mozilla has killed the 64-bit version of Firefox before it ever became widely available.
Engineering Manager Benjamin Smedberg posted the decision in a discussion thread titled "Turning off win64 builds."
Smedberg did post the reasons, with most making sense (via TNW):
Many plugins are not available in 64-bit versions.
The plugins that are available don't work correctly in Firefox because we haven't implemented things like windowproc hooking, which means that hangs are more common.
Crashes submitted by 64-bit users are currently not high priority because we are working on other things.
This is frustrating for users because they feel (and are!) second-class.
It is also frustrating for stability team triage because crash-stats does not easily distinguish between 32-bit and 64-bit builds in the topcrash lists and other reports. We basically ignore a set of nightly "topcrashes" because they are 64-bit only. (See bug 811051).