title: pdf.js 2.11.338: Display filled-out AcroForms read-only?
body: <p>Putting together a PDF viewer based on the excellent Mozilla pdf.js. I'm modifying <code>pageviewer.js</code> found in their <code>examples/components</code> directory.</p>
  <p>Displaying and filling out AcroForms forms works beautifully.</p>
  <p>But I'd also like to display the resulting filled-out form in read-only mode for the user to inspect before submitting.</p>
  <p>How do I turn the viewer read-only? The documentation is, well, somewhat sparse. Searches mostly bring up results for the full viewer.</p>