The problem was in the Fanboy’s Annoyance List filter for the uBlock Origin extension.
uBlock origin is an adblock extension, and the Fanboy’s Annoyance List is an add-on for uBlock that blocks annoying pop ups such as “Accept Cookies” and other minor annoyances.
When I disabled the Fanboy’s Annoyance List filter, the WPZOOM plug-in immediately started working!
Just to be clear, the problem was NOT in uBlock Origin. The problem was in the add-on FOR uBlock Origin.
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This reply was modified 5 years, 8 months ago by larper. Reason: added last sentence so it's clear the problem was in the filter for uBlock, not in uBlock per se