I can reproduce this error on hardy. More info:
$ dpkg -l yelp | grep ii
ii yelp 2.22.1-0ubuntu1
Help browser for GNOME 2
$ dpkg -l xulrunner* | grep ii
ii xulrunner-1.9 1.9~b5+nobinonly-0ubuntu1
XUL + XPCOM application runner
ii xulrunner-1.9-gnome-support 1.9~b5+nobinonly-0ubuntu1
Support for Gnome in xulrunner-1.9 applicati
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Gnome Help stops responding until Firefox closes
https://bugs.launchpad.net/bugs/173636
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