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Issue #2971120: Extra options for PDF.JS Viewer
Issue #3076198: Allow users to specify a custom viewer.html file
Issue #3135615: Add Drupal 9 compatibility
Issue #3158368: Update to work with the latest version of PDF.js.
If you are using PDF.js older than 2.0.491, please update it to avoid the XSS vulnerability CVE-2018-5158.