Firefox causes the command line to hang?

[Jeremy]

Hmmmmmm.

Anyone else noticed (or got a solution ;-)) ) that if you start firefox from any of these: command line / batch file / system call in perl, then it doesn't 'report back' to the system that it's done and the process hangs / doesn't go any further?

This is using FF 1.5.0.7 on WinXP.

Is it the same under Linux & other OS flavours, or its it Windows?

I'm writing a little perl script which works through an array of URLs to send firefox to the URL and then do a screencap. If FF is already started it runs fine and dandy, but if FF isn't running and the script needs to start it, then it hangs after starting FF.

The same 'hanging' happens if I start FF from the command line itself, or a batch file.