Saving as web page, not article

All of a sudden, I am failing to save a journal article (JoV, Google Scholar, etc.) as an article in Firefox. The Zotero icon is there, but I can only save an article as a Web Page.

I have updated the Zotero dictionary to no avail. I also disabled the Firefox add-on and restarted the browser, and I could save as an article!.. But only for a few minutes or so, after which the issue returned. Those pages that were previously loaded still show the save as an article icon, but if I click it, it reports "An error occurred while saving this item". Upon reloading this page, the Zotero icon changes to "Save as a Web Page".

Zotero was working fine just yesterday. Any ideas?
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