diff --git a/web/app.js b/web/app.js
index 125a56644..3a66de48a 100644
--- a/web/app.js
+++ b/web/app.js
@@ -2274,39 +2274,19 @@ function webViewerInitialized() {
   }
 }
 
-let webViewerOpenFileViaURL;
-if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) {
-  webViewerOpenFileViaURL = function (file) {
-    if (file && file.lastIndexOf("file:", 0) === 0) {
-      // file:-scheme. Load the contents in the main thread because QtWebKit
-      // cannot load file:-URLs in a Web Worker. file:-URLs are usually loaded
-      // very quickly, so there is no need to set up progress event listeners.
-      PDFViewerApplication.setTitleUsingUrl(file);
-      const xhr = new XMLHttpRequest();
-      xhr.onload = function () {
-        PDFViewerApplication.open(new Uint8Array(xhr.response));
-      };
-      xhr.open("GET", file);
-      xhr.responseType = "arraybuffer";
-      xhr.send();
-      return;
-    }
-
+function webViewerOpenFileViaURL(file) {
+  if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) {
     if (file) {
       PDFViewerApplication.open(file);
     }
-  };
-} else if (PDFJSDev.test("MOZCENTRAL || CHROME")) {
-  webViewerOpenFileViaURL = function (file) {
+  } else if (PDFJSDev.test("MOZCENTRAL || CHROME")) {
     PDFViewerApplication.setTitleUsingUrl(file);
     PDFViewerApplication.initPassiveLoading();
-  };
-} else {
-  webViewerOpenFileViaURL = function (file) {
+  } else {
     if (file) {
       throw new Error("Not implemented: webViewerOpenFileViaURL");
     }
-  };
+  }
 }
 
 function webViewerResetPermissions() {