They are going to stop doing 64bit nightlys for Firefox.
first source
http://www.engadget.com/2012/11/22/f...mozi/#comments
Looking to browse with the full weight of your 64-bit hardware? Well, if you're a Firefox and Windows user, you're going to have to look elsewhere, as Mozilla has announced it's closing the development of Firefox for the bigger computer architecture. Mozilla manager, Benjamin Smedberg outlined several reasons for the decision, including limited access to 64-bit plugins, a higher propensity for the browser to hang when using available plug-ins and difficulty distinguishing between 32- and 64-bit versions when dealing with stability complaints. After posting the announcement at Bugzilla, it riled plenty of nightly testers, with one Mozilla dev suggesting that around half of them were currently using the now defunct 64-bit version -- presumably due to the fact that an official release never made it out of the gates. What are the options then, if you need your browsing 64-bit? You could return to Internet Explorer or give Opera a try -- both offer a higher bit version, or make a switch to either OS X or Linux, both of which have fully-fleshed versions of the 64-bit web browser. Check out some of the (surprisingly vigorous) debate at the source below.
https://bugzilla.mozilla.org/show_bug.cgi?id=814009
Per newsgroup discussion. Please stop building windows 64 builds and tests. This includes the following subtasks, which I'm not filing specific bugs on but you may want to break these out:
* stop building win64 nightlies
* repatriate existing win64 nightly users onto win32 builds using a custom update
* stop doing win64 "hourly" builds on mozilla-central and other branches
* disable the win64 option in try/trychooser
This bug is not the place to argue about this decision, which has already been made. If there is critical data which you think should be heard about this decision, please post it to mozilla.dev.apps.firefox.
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