[JavaScript Error: "www-1jstor-1org-141h24ocm01a8.[…]:443 uses an invalid security certificate.
The certificate is not trusted because the issuer certificate is unknown. The server might not be sending the appropriate intermediate certificates. An additional root certificate may need to be imported.
Error code: SEC_ERROR_UNKNOWN_ISSUER
Your proxy server is misconfigured. Send this page to your IT department or library:
https://www.zotero.org/support/kb/incomplete_cert_chain
They can see that the server shows "Chain issues: Incomplete" on the SSL Labs test, as explained there.