kb:safari 12 connector [Zotero Documentation]
Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Note that a version of the Zotero Connector that works with Safari 12 is available from the Zotero download page:
Apple is, however, making Safari extensions less powerful and harder to build. More details:
Missing the Zotero Connector after upgrading Safari or macOS? You can now install the Zotero Connector in the latest version of Safari