Crash when downloading pdf attachments

I have a problem when I try to save a reference and the pdf file of an article, for example from Jstor. It does not happen in every case, but still it is very frequent.
When I click on the icon on the URL bar to save the reference, the "saving item" window appears, but after a couple of seconds the mouse cursor turns into a spinning wheel and Firefox does not respond no more. The only thing I can do is to force quit Firefox. When I restart it, the item was saved with the pdf attached to it, but still it is very annoying and I fear that the data base might get corrupted by repeatedly force-quitting while Zotero is saving a file.
I am using Firefox 2.0.0.14 and Mac Os X 10.5.2. Zotero is the only plug-in I use, beside the British dictionary, DOM inspector and Talkback.
Thank you for your help.
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