The Browse Activity (sugar-browse) doesn't run in the Sugar Environment. It seems its due to issues with hulahop due to changes in the xulrunner api
Discussed at 2011-04-21 blocker review meeting (http://meetbot.fedoraproject.org/fedora-bugzappers/2011-04-21/f15-blocker-review.2011-04-21-17.00.html) ... AGREED: 697689 - AcceptedNTH - infringes desktop criteria for a non-default desktop
*** Bug 702480 has been marked as a duplicate of this bug. ***
hulahop won't be ported to xulrunner 2+ so closing this