This suggests that there won't be an official 64-bit build of Firefox 4 -- we'll have to wait for Firefox 5.
As some people comment below me, only some parts of it are working in the 64-bit space (and most notably, the Flash 64-bit plug-in is still beta/alpha.)
There are 64-bit nightly builds of FF4, but _only_ nightlies: http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/lates...
This suggests that there won't be an official 64-bit build of Firefox 4 -- we'll have to wait for Firefox 5.
As some people comment below me, only some parts of it are working in the 64-bit space (and most notably, the Flash 64-bit plug-in is still beta/alpha.)