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diff --git a/dom/chrome-webidl/ClonedErrorHolder.webidl b/dom/chrome-webidl/ClonedErrorHolder.webidl
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index 0000000000..cfdc5a728d
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+++ b/dom/chrome-webidl/ClonedErrorHolder.webidl
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * A stub object to hold an Error, Exception, or DOMException object to be
+ * transferred via structured clone. The object will automatically be decoded
+ * directly into the type of the error object that it wraps.
+ *
+ * This is a temporary workaround for lack of native Error and Exception
+ * cloning support, and can be removed once bug 1556604 and bug 1561357 are
+ * fixed.
+ */
+[ChromeOnly, Exposed=(Window,Worker)]
+interface ClonedErrorHolder {
+  [Throws]
+  constructor(object aError);
+};