Zotero Connector does not recognise WorldCat (or any relevant site) in a different computer


I have been using Zotero for a few weeks on my laptop and it's been working great. The Zotero connector plugin could automatically recognise many sites and pick up metadata. Recently, I tried installing Zotero on my old desktop (Windows 7) but the Firefox connector on this PC does not recognise even WorldCat or Google Books. It recognises every page only a website and picks up just the page title and URL. My Firefox is up-to-date [Version 78.0 (32-bit)] on this PC though.

Is there anything I should do to fix this?
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