Building www/firefox with PGO enabled fails

[Mikhail T.]

A freshly csup-ed ports tree. No local modifications:

[...]
   /usr/local/bin/zip -r9D /home/ports/www/firefox/work/mozilla-release/obj-i386-unknown-freebsd8.2/browser/locales/../../dist/install/firefox-6.0.2.en-US.langpack.xpi install.rdf chrome chrome.manifest -x chrome/en-US.manifest
updating: install.rdf (deflated 50%)
updating: chrome/en-US.jar (deflated 75%)
updating: chrome.manifest (deflated 78%)
gmake[4]: Leaving directory `/home/ports/www/firefox/work/mozilla-release/obj-i386-unknown-freebsd8.2/browser/locales'
gmake[3]: Leaving directory `/home/ports/www/firefox/work/mozilla-release/obj-i386-unknown-freebsd8.2/browser/installer'
gmake tools
gmake[3]: Entering directory `/home/ports/www/firefox/work/mozilla-release/obj-i386-unknown-freebsd8.2/browser/installer'
gmake[3]: Nothing to be done for `tools'.
gmake[3]: Leaving directory `/home/ports/www/firefox/work/mozilla-release/obj-i386-unknown-freebsd8.2/browser/installer'
if test -d ../../dist/bin ; then touch ../../dist/bin/.purgecaches ; fi
hg: not found
gmake[2]: Leaving directory `/home/ports/www/firefox/work/mozilla-release/obj-i386-unknown-freebsd8.2/browser/installer'
gmake[1]: Leaving directory `/home/ports/www/firefox/work/mozilla-release/obj-i386-unknown-freebsd8.2'
OBJDIR=obj-i386-unknown-freebsd8.2 /opt/bin/python2.7 obj-i386-unknown-freebsd8.2/_profile/pgo/profileserver.py
args: ['/home/ports/www/firefox/work/mozilla-release/obj-i386-unknown-freebsd8.2/dist/firefox/firefox-bin', '-no-remote', '-profile', '/home/ports/www/firefox/work/mozilla-release/obj-i386-unknown-freebsd8.2/_profile/pgo/pgoprofile/','http://127.0.0.1:8888/index.html']
INFO | automation.py | Application pid: 89018
:1: error: unexpected character `/', expected keyword - e.g. `style'
g_dbus_connection_real_closed: Remote peer vanished with error: Underlying GIOStream returned 0 bytes on an async read (g-io-error-quark, 0). Exiting.
TEST-UNEXPECTED-FAIL | automation.py | Exited with code -15 during test run
INFO | automation.py | Application ran for: 0:00:01.392013
INFO | automation.py | Reading PID log: /tmp/tmpVEScBapidlog
gmake: *** [profiledbuild] Error 241
*** Error code 1

Stop in /home/ports/www/firefox.
*** Error code 1

Stop in /home/ports/www/firefox.

The port built/installed fine after I disabled PGO. Please, advise. Thanks! Yours,

	-mi