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diff --git a/browser/components/syncedtabs/util.sys.mjs b/browser/components/syncedtabs/util.sys.mjs
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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/. */
+
+// Get the chrome (ie, browser) window hosting this content.
+export function getChromeWindow(window) {
+ return window.browsingContext.topChromeWindow;
+}