Error downloading all refs. to pdfs from Google Scholar in Firefox

Error report submitted: 1309019274.
Zotero and Google Scholar both open, but Firefox extension for Zotero is now only working to save books and not pdfs to Zotero to Library. Previously worked for pdfs, too. Seems to apply with any books and all pdfs. Specific example is:
[PDF] Reciprocal economic and spiritual implications of vocation
P Coz - Asian Journal of Pentecostal Studies, 2019 -

Any ideas, please?
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