system() waits until the running program has completed its execution before running the next line. So you are opening mozilla and then perl waits for you to close mozilla before it tries running the next one.

I was going to introduce a way of forking each URL into the browser, but I thought of using backticks, which do not block until execution is complete. So you end up with this:

my @urls = (
 'www.perlmonks.org',
 'www.metafilter.org',
 'www.slashdot.org'
);

`mozilla`;
`mozilla -remote "openURL ($_, new-tab)"` for @urls;
[download]

Update: Just to point out one little thing, the system ("mozilla -remote openURL (www.perlmonks.org, new-tab)"); isn't quite correct. The command to remote has to be contained within quotes, so something along the lines of system ('mozilla -remote "openURL (www.perlmonks.org, new-tab)"'); is necessary. :)

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