Zotero items are not added

We're experiencing a problem as follows: Clicking the Zotero icon (e.g. a book, in the address bar in FF) doesn't add the book to the Zotero library. This happens for a number of different sites (e.g. our Cambridge library site, google scholar) but not for all of them. Also, on some computers (all with same Zotero install) e.g. google scholar works, on others it doesn't.

Any thoughts?
Bjoern
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