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• A temporary solution for linux users was found in https://stackoverflow.com/questions/3450616/convert-pdf-from-version-1-1-to-1-4-or-higher#58108270 gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -o output.pdf input.pdf

  in Zotero built-in PDF viewer could not display texts correctly Comment by bi2022 March 29, 2023
• This issue still persists. However the pdf.js mentioned in this thread should be fixed by now as my firefox displays the pdfs correctly. $ zotero --version Zotero Zotero 6.0.23, Copyright (c) 2006-2018 Contributors os: ubuntu 22.10

  in Zotero built-in PDF viewer could not display texts correctly Comment by bi2022 March 29, 2023