double metadata download

Hi, got a bit of weird behaviour. When I have a pdf open in Firefox and I click download, then select 'Save to Zotero' and 'Retrieve Metadata for PDF' it happens twice. I get the little pop-up in the bottom right hand corner, but there are two pdfs. One succeeds and I get the, for instance journal article with pdf attached, the other fails and I just get the journal article.
Very odd.

Here's an example where it happens:

http://mind.oxfordjournals.org.ezproxy.lib.monash.edu.au/content/116/464/851.full.pdf+html

Windows 7, Firefox 42, Zotero 4.0.28.7
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