diff --git a/web/app.js b/web/app.js
index 2fafc769d9284..f60bf0296bec1 100644
--- a/web/app.js
+++ b/web/app.js
@@ -2127,14 +2127,11 @@ if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) {
         // Hosted or local viewer, allow for any file locations
         return;
       }
-      const { origin, protocol } = new URL(file, window.location.href);
+      const fileOrigin = new URL(file, window.location.href).origin;
       // Removing of the following line will not guarantee that the viewer will
       // start accepting URLs from foreign origin -- CORS headers on the remote
       // server must be properly configured.
-      // IE10 / IE11 does not include an origin in `blob:`-URLs. So don't block
-      // any blob:-URL. The browser's same-origin policy will block requests to
-      // blob:-URLs from other origins, so this is safe.
-      if (origin !== viewerOrigin && protocol !== "blob:") {
+      if (fileOrigin !== viewerOrigin) {
         throw new Error("file origin does not match viewer's");
       }
     } catch (ex) {