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Re:Mozilla quietly kills Firefox 64-bit for Windows by CJefferson on Thursday November 22, 2012 @08:15AM (#4818629)
While having a 64-bit OS is useful, the majority of apps I work on never use anywhere near 4GB. Firefox has distributed 64-bit builds, so it is not the case that they aren't willing to put the work in. However, there turns out to be basically no advantage to running a 64-bit web browser.
Re:Mozilla quietly kills Firefox 64-bit for Windows by gryph0n on Friday November 23, 2012 @12:51AM (#4821111)
If you're a heavy browser user, or if you simply never close your browser, you'll frequently run into the scenario where 32 bit Firefox reaches the 2GB virtual memory limit, whereupon it gets killed. Yep, it's 2GB, atleast on 32bit OS (I'm on Win 7 32bit).

Just the convenience factor of not having to restart my browser frequently is enough to make me want to embrace x64. My blocker is that my corporate IT policy is to have 32 bit OS.