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Deadlocks occur when different types of dialogs interfere on Mac OS X
When a file or print dialog is open from Firefox on Mac OS X any confirmation dialog -- which opens in the browser window, not a seperate window like the file dialog -- will cause the browser to lock up.
The file dialog still has the focus, and keeps it, whatever you do, but input is locked to the confirmation dialog. So you can click the OK and Abort buttons in the file dialog, without any effect, but you can't click the buttons in the confirmation dialog.
This happens e.g. when a cookie warning is displayed.
It happens also, when using AdBlock, because the open file or print dialog will trigger a deadlock prevention feature, which in turn will shoot itself in the foot by displaying a confirmation dialog asking to stop an AdBlock script being run.