Filing at request of bug 620598 comment 396. Test was disabled on Linux by https://hg.mozilla.org/mozilla-central/rev/3f0b1cc00bc2 for frequent timeouts.
This was fixed on mozilla-central at 2012-08-18 00:26:45 NZST by bug 761917. This test has now been re-enabled: https://hg.mozilla.org/integration/mozilla-inbound/rev/7a9ef73422de
Closing this bug, bug 780490 will track merging the changeset to mozilla-central.