Google scholar items not showing in Zotero dropdown

I've been using Zotero for some time without problem. To add references, I usually go from Google Scholar. Search in Scholar, click the Zotero button, choose the papers, and go. Fantastic.

But currently, the Zotero button doesn't give me an option to import from Scholar, only options to save as Web Page.

Using Zotero 4.0.29.6 and Firefox 45.0.1. Many thanks.
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