I've been running 1.0pre against a XULRunner built off of mozilla-central.  I noticed that pasting data
to conkeror from the clipboard resulted in a SEGV.  Poking around, I discovered:

https://bugzilla.mozilla.org/show_bug.cgi?id=769440

In short, in order to support private browsing, nsITransferable objects are now required to be
initialized after being created.  I've attached a patch against the current git tree which fixes the SEGV.