latest firefox upgrade broke zotero

Since a couple of days the Firefox Zotero 5 add-on fails to add items from Google scholar to Zotero database. This apparently happens since the last Firefox upgrade:

[2017-11-22 12:39] [ALPM] upgraded firefox (56.0.2-1 -> 57.0-2)

The standalone Zotero 5.0.28 is loaded, and Zotero Status gives me Zotero is currently available. I am also logged in to zotero.org and checked that the entries don't get saved in the online database either.
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