OK, here's what prompted the error message:
javascript:(function()%20{%20window.open('https://www.eatyourbooks.com/bookshelf/add-online-recipe?url='+encodeURIComponent(window.location.href), '_blank', 'location=no,links=no,scrollbars=yes,toolbar=no,status=no,menubar=no,width=1040,height=800');%20})();
And the error message is:
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