AdobePDFViewerNPAPI
Adobe PDF Viewer NPAPI is an internet plug-in that enables PDF viewing directly within web browsers on macOS. NPAPI (Netscape Plug-in Application Programming Interface) is a legacy plug-in architecture that was once the standard way browsers loaded third-party content handlers. This particular plug-in allows users to open and view PDF files through the browser without downloading them separately. Adobe Systems developed and maintained this plug-in as part of its broader PDF ecosystem, though modern browsers have phased out NPAPI in favour of safer, built-in or sandboxed content handlers.
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1 suggestionAdobe PDF Viewer NPAPI is a legacy internet plug-in that has effectively reached end-of-life. Apple and major browser vendors (Safari, Chrome, Firefox) discontinued support for NPAPI plug-ins years ago — Safari removed NPAPI support entirely in 2015, and Chrome and Firefox followed suit shortly after. This plug-in will not function in any modern macOS browser regardless of CPU architecture, and there is no active native Apple Silicon build of it because the underlying NPAPI standard is obsolete. The plug-in cannot be updated separately; it was distributed as part of Adobe Reader or Acrobat DC when it was still maintained, but modern versions of those products do not ship NPAPI anymore. If you encounter a PDF link in a web browser, Safari, Chrome and Firefox will handle the display natively using built-in PDF viewers or will prompt you to download the file for viewing in Adobe Acrobat Reader DC (which has a native Apple Silicon build available from Adobe). You can safely uninstall or ignore any remaining NPAPI plug-in files on your system — they serve no purpose in contemporary browsers.
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