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I have zone alarm and it is telling me that firefox wants to accept connections. Why would it want to do this? It may be a plugin, but I can't think of anything that would require that. Not that it would work through my firewall.

Stopping this dosn't seem to stop anything working, which makes me even more curious.

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Does it happen when you're on a particular site? – balpha Aug 13 '09 at 16:58
What port is it trying to open? Does it happen in safe mode? – heavyd Aug 13 '09 at 17:02

It might be an add-on you're using. Make sure you don't have any exception for Firefox, then try disabling all add-ons, and enable one by one to see if something triggers your firewall.

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