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diff --git a/toolkit/components/pdfjs/test/test_pdf_file_in_iframe.html b/toolkit/components/pdfjs/test/test_pdf_file_in_iframe.html
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+++ b/toolkit/components/pdfjs/test/test_pdf_file_in_iframe.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+  <meta charset="utf-8">
+  <title>PDFjs: Load a PDF in an iframe.</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/EventUtils.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+
+<body>
+  <pre id="test">
+        <script type="text/javascript">
+          "use strict";
+
+          async function test() {
+            await SpecialPowers.pushPrefEnv({
+              "set": [
+                ["pdfjs.disabled", false],
+                ["pdfjs.enableFloatingToolbar", false],
+              ],
+            });
+
+            const iframe = document.createElement("iframe");
+            document.body.append(iframe);
+            iframe.src = "file_pdfjs_test.pdf";
+            iframe.onload = async () => {
+              const hasViewerContainer = await SpecialPowers.spawn(
+                iframe.contentWindow,
+                [],
+                () => !!this.content.document.getElementById("viewerContainer")
+              );
+              ok(
+                hasViewerContainer,
+                "The iframe with a pdf must have a `viewerContainer`"
+              );
+              SimpleTest.finish();
+            };
+          }
+
+          window.onload = () => {
+            SimpleTest.waitForExplicitFinish();
+            test();
+          };
+        </script>
+    </pre>
+</body>
+
+</html>