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diff --git a/netwerk/test/unit/test_signature_extraction.js b/netwerk/test/unit/test_signature_extraction.js
new file mode 100644
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+++ b/netwerk/test/unit/test_signature_extraction.js
@@ -0,0 +1,203 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * This file tests signature extraction using Windows Authenticode APIs of
+ * downloaded files.
+ */
+
+////////////////////////////////////////////////////////////////////////////////
+//// Globals
+"use strict";
+
+ChromeUtils.defineESModuleGetters(this, {
+  FileTestUtils: "resource://testing-common/FileTestUtils.sys.mjs",
+});
+
+const BackgroundFileSaverOutputStream = Components.Constructor(
+  "@mozilla.org/network/background-file-saver;1?mode=outputstream",
+  "nsIBackgroundFileSaver"
+);
+
+const StringInputStream = Components.Constructor(
+  "@mozilla.org/io/string-input-stream;1",
+  "nsIStringInputStream",
+  "setData"
+);
+
+const TEST_FILE_NAME_1 = "test-backgroundfilesaver-1.txt";
+
+/**
+ * Returns a reference to a temporary file that is guaranteed not to exist and
+ * is cleaned up later. See FileTestUtils.getTempFile for details.
+ */
+function getTempFile(leafName) {
+  return FileTestUtils.getTempFile(leafName);
+}
+
+/**
+ * Waits for the given saver object to complete.
+ *
+ * @param aSaver
+ *        The saver, with the output stream or a stream listener implementation.
+ * @param aOnTargetChangeFn
+ *        Optional callback invoked with the target file name when it changes.
+ *
+ * @return {Promise}
+ * @resolves When onSaveComplete is called with a success code.
+ * @rejects With an exception, if onSaveComplete is called with a failure code.
+ */
+function promiseSaverComplete(aSaver, aOnTargetChangeFn) {
+  return new Promise((resolve, reject) => {
+    aSaver.observer = {
+      onTargetChange: function BFSO_onSaveComplete(aSaver, aTarget) {
+        if (aOnTargetChangeFn) {
+          aOnTargetChangeFn(aTarget);
+        }
+      },
+      onSaveComplete: function BFSO_onSaveComplete(aSaver, aStatus) {
+        if (Components.isSuccessCode(aStatus)) {
+          resolve();
+        } else {
+          reject(new Components.Exception("Saver failed.", aStatus));
+        }
+      },
+    };
+  });
+}
+
+/**
+ * Feeds a string to a BackgroundFileSaverOutputStream.
+ *
+ * @param aSourceString
+ *        The source data to copy.
+ * @param aSaverOutputStream
+ *        The BackgroundFileSaverOutputStream to feed.
+ * @param aCloseWhenDone
+ *        If true, the output stream will be closed when the copy finishes.
+ *
+ * @return {Promise}
+ * @resolves When the copy completes with a success code.
+ * @rejects With an exception, if the copy fails.
+ */
+function promiseCopyToSaver(aSourceString, aSaverOutputStream, aCloseWhenDone) {
+  return new Promise((resolve, reject) => {
+    let inputStream = new StringInputStream(
+      aSourceString,
+      aSourceString.length
+    );
+    let copier = Cc[
+      "@mozilla.org/network/async-stream-copier;1"
+    ].createInstance(Ci.nsIAsyncStreamCopier);
+    copier.init(
+      inputStream,
+      aSaverOutputStream,
+      null,
+      false,
+      true,
+      0x8000,
+      true,
+      aCloseWhenDone
+    );
+    copier.asyncCopy(
+      {
+        onStartRequest() {},
+        onStopRequest(aRequest, aContext, aStatusCode) {
+          if (Components.isSuccessCode(aStatusCode)) {
+            resolve();
+          } else {
+            reject(new Components.Exception(aStatusCode));
+          }
+        },
+      },
+      null
+    );
+  });
+}
+
+var gStillRunning = true;
+
+////////////////////////////////////////////////////////////////////////////////
+//// Tests
+
+add_task(function test_setup() {
+  // Wait 10 minutes, that is half of the external xpcshell timeout.
+  do_timeout(10 * 60 * 1000, function () {
+    if (gStillRunning) {
+      do_throw("Test timed out.");
+    }
+  });
+});
+
+function readFileToString(aFilename) {
+  let f = do_get_file(aFilename);
+  let stream = Cc["@mozilla.org/network/file-input-stream;1"].createInstance(
+    Ci.nsIFileInputStream
+  );
+  stream.init(f, -1, 0, 0);
+  let buf = NetUtil.readInputStreamToString(stream, stream.available());
+  return buf;
+}
+
+add_task(async function test_signature() {
+  // Check that we get a signature if the saver is finished on Windows.
+  let destFile = getTempFile(TEST_FILE_NAME_1);
+
+  let data = readFileToString("data/signed_win.exe");
+  let saver = new BackgroundFileSaverOutputStream();
+  let completionPromise = promiseSaverComplete(saver);
+
+  try {
+    saver.signatureInfo;
+    do_throw("Can't get signature before saver is complete.");
+  } catch (ex) {
+    if (ex.result != Cr.NS_ERROR_NOT_AVAILABLE) {
+      throw ex;
+    }
+  }
+
+  saver.enableSignatureInfo();
+  saver.setTarget(destFile, false);
+  await promiseCopyToSaver(data, saver, true);
+
+  saver.finish(Cr.NS_OK);
+  await completionPromise;
+
+  // There's only one Array of certs(raw bytes) in the signature array.
+  Assert.equal(1, saver.signatureInfo.length);
+  let certLists = saver.signatureInfo;
+  Assert.ok(certLists.length === 1);
+
+  // Check that it has 3 certs(raw bytes).
+  let certs = certLists[0];
+  Assert.ok(certs.length === 3);
+
+  const certDB = Cc["@mozilla.org/security/x509certdb;1"].getService(
+    Ci.nsIX509CertDB
+  );
+  let signer = certDB.constructX509(certs[0]);
+  let issuer = certDB.constructX509(certs[1]);
+  let root = certDB.constructX509(certs[2]);
+
+  let organization = "Microsoft Corporation";
+  Assert.equal("Microsoft Corporation", signer.commonName);
+  Assert.equal(organization, signer.organization);
+  Assert.equal("Copyright (c) 2002 Microsoft Corp.", signer.organizationalUnit);
+
+  Assert.equal("Microsoft Code Signing PCA", issuer.commonName);
+  Assert.equal(organization, issuer.organization);
+  Assert.equal("Copyright (c) 2000 Microsoft Corp.", issuer.organizationalUnit);
+
+  Assert.equal("Microsoft Root Authority", root.commonName);
+  Assert.ok(!root.organization);
+  Assert.equal("Copyright (c) 1997 Microsoft Corp.", root.organizationalUnit);
+
+  // Clean up.
+  destFile.remove(false);
+});
+
+add_task(function test_teardown() {
+  gStillRunning = false;
+});