Loss of download folder in PubMed

Hello,
I am using Zotero 1.5b2 on Windows XP Professional with Firefox 3.0.8. I recently noticed that the download folder icon is missing in the address bar when I search PubMed. Only the single-citation icon (it looks like a printed page) appears, and only downloads the first citation in my search.
Does anyone know how I can recover the folder icon?
Thank you.
JudyBlue

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