pdfjs-dist/web/default_preferences.json

{
  "showPreviousViewOnLoad": true,
  "defaultZoomValue": "",
  "sidebarViewOnLoad": 0,
  "enableHandToolOnLoad": false,
  "enableWebGL": false,
  "pdfBugEnabled": false,
  "disableRange": false,
  "disableStream": false,
  "disableAutoFetch": false,
  "disableFontFace": false,
  "disableTextLayer": false,
  "useOnlyCssZoom": false,
  "externalLinkTarget": 0,
  "enhanceTextSelection": false,
  "renderer": "canvas",
  "renderInteractiveForms": false,
  "enablePrintAutoRotate": false,
  "disablePageLabels": false
}