Since 01-iceweasel might be (or: is) executed after GRMLBASE/98-clean-chroot
the /etc/iceweasel/profile/prefs.js.pro_fcopy might be left.
Avoid that by using fcopy's -B switch.
-fcopy -v /etc/iceweasel/profile/prefs.js
+fcopy -B -v /etc/iceweasel/profile/prefs.js
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