Firefox saving of Wall St. Journal articles problems

I tried this morning to save two articles from the Wall St. Journal to Zotero and encountered problems. The Zotero button in Firefox showed there to be a problem: "An error occurred saving.... Attempting to use metadata."
An item was saved in my Zotero library but as a webpage rather than as a newspaper article.
One of the items I tried to save is here:

I'm operating Mac 10.14.5 (currently available update), Firefox 67.0.3 (64-bit). I've restarted Firefox and Zotero and that hasn't solved the problem.
Thanks and thanks for Zotero.
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