Debian Bug: Iceweasel w/ Gtk-qt-engine Installed Consumes 100% CPU Power

After my recent trial run of the latest Kanotix I bumped into a bug with Iceweasel and gtk-qt-engine under KDE 4, as described in this 572162 and this bug report 543402, and possibly 523824.
Iceweasel on exiting leaves a process behind that consumes 100% CPU power on one core which can only be terminated by killing the PID.
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