Dragging PDF--wrong file shows up in Zotero

I have this odd problem that occasionally happens. I am increasingly building my library by downloading a pdf, dragging it into the Zotero pain, and then retrieving metadata for it (particularly since Science Direct doesn't seem to scrape).

I sometimes get this problem where the PDF file saved on my (Mac) Desktop shows up in Zotero as a completely unrelated webpage (but one that I happened to view earlier), rather than the desired PDF. The only way to avoid this is to close out of Firefox.

Any insights into how to fix this?

Thanks.
  • Is the wrong item the one that's created by Retrieve Metadata from PDF, or the PDF attachment itself?

    Does restarting fix the problem? As in, is this a display-only issue?
  • It's caused by the PDF. When I drag the PDF in, it indexes a different item. Restarting FF seems to fix it.

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