PDF reader for Firefox 4 and/or 5

I am using Firefox 3.6 in order to retain usage of the add-in a PDF browser plugin that opens in the browser window instead of in a separate application (Firefox PDF Plugin for Mac OS X 1.1.3). It has not been updated to work with Firefox 4 or 5.
With my upgrade to OS X Lion I read that Firefox 3.6 isn't that stable and I've had crashing problems.
Can anyone refer me to a PDF browser plugin that plays nicely with Zotero, in particular allowing the saving of PDFs in the browser to one's Zotero library.
Thank you.
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