We have finally flipped this on for our official Firefox Linux builds using GCC 4.5, see https://bugzilla.mozilla.org/show_bug.cgi?id=559964 . Doing PGO for XULRunner would be a little different, since you'd need a different profiling script.
** Bug watch added: Mozilla Bugzilla #559964 https://bugzilla.mozilla.org/show_bug.cgi?id=559964 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/213708 Title: Please compile Firefox with PGO optimizations -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
