Zotero not saving HeinOnline PDF

Having trouble saving PDF using the Firefox plug-in. It has previously worked: logging in through our library's proxy and using the plug-in imports the PDF, not an issue before. Nothing on our library's end has changed, and other databases work fine. I tried contacting HeinOnline, but haven't heard anything.

Seems like the same issue as https://forums.zotero.org/discussion/comment/438584#Comment_438584
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