This might get you what you want:

Update: Corrections thanks to ikegami. 

...
my $pid = open CMD, "iceweasel -new-window '$url' |" or die $!;
...
kill 'TERM', $pid;

## Maybe also use waitpid here?

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In reply to Re: end "system" by BrowserUk
in thread end "system" by PierreL

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