说明：此版本不是官方正式的发布版，不推荐普通用户下载使用。喜欢速度的FFer们可以偷笑了。
小知识：简单的的说PGO就是可以让程序使用最新CPU特性的优化编译方法，编译的时候会花费几乎两倍的时间，但是跑起来飞快！

mozillazine原帖：
I'm working on making PGO builds in an automated fashion (we'd like to switch the nightlies to use PGO), and as such I've been building with PGO a lot lately. I figured these builds could use a bit of testing, and I know you guys like fast builds, so give this one a shot:
http://people.mozilla.com/~tmielczarek/firefox-3.0b4pre.en-US.win32.zip

It's essentially just today's nightly built with my build config changes from bug 361343, with a little bit of profiling and then rebuilt with PGO. No other local patches or optimizations. I think Breakpad is enabled on this build, but the symbols haven't been uploaded, so the crash reports aren't useful.

Questions or feedback here or on the bug would be great.

Thanks!

下载地址：
http://people.mozilla.com/~tmielczarek/firefox-3.0b4pre.en-US.win32.zip

性能：
http://wd-testnet.world-direct.at/mozilla/dhtml/funo/jsTimeTest.htm
327 ms
http://webkit.org/perf/sunspider-0.9/sunspider.html
4700 ms