in reply to Re^6: IE vs. Firefox : Can't use an undefined value as a HASH reference error
in thread IE vs. Firefox : Can't use an undefined value as a HASH reference error

print "<$_>\n" for keys %{$def_obj->{'.tmpfiles'}};

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instead of using Dumper.
Update: added brackets around $_, in case of sneaky whitespace.
Caution: Contents may have been coded under pressure.
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