All the data you pull out of Firefox as HTML elements (through the ->xpath method or the ->selector method, for example), keeps the bridge into Firefox alive. So you need to make sure you don't have any more such objects lying around when you want a clean exit (or you just ignore the warning messages).

I'm not sure why the script would hang at the second round. Maybe the site does not load some data it loads on the first round. You'll have to debug the behaviour of the site when automating it.

In reply to Re^3: MozRepl cleanup problem by Corion
in thread MozRepl cleanup problem by giantpanda

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