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diff --git a/browser/components/sessionstore/test/browser_687710.js b/browser/components/sessionstore/test/browser_687710.js
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+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test that sessionrestore handles cycles in the shentry graph properly.
+//
+// These cycles shouldn't be there in the first place, but they cause hangs
+// when they mysteriously appear (bug 687710). Docshell code assumes this
+// graph is a tree and tires to walk to the root. But if there's a cycle,
+// there is no root, and we loop forever.
+
+var stateBackup = ss.getBrowserState();
+
+var state = {
+ windows: [
+ {
+ tabs: [
+ {
+ entries: [
+ {
+ docIdentifier: 1,
+ url: "http://example.com",
+ triggeringPrincipal_base64,
+ children: [
+ {
+ docIdentifier: 2,
+ url: "http://example.com",
+ triggeringPrincipal_base64,
+ },
+ ],
+ },
+ {
+ docIdentifier: 2,
+ url: "http://example.com",
+ triggeringPrincipal_base64,
+ children: [
+ {
+ docIdentifier: 1,
+ url: "http://example.com",
+ triggeringPrincipal_base64,
+ },
+ ],
+ },
+ ],
+ },
+ ],
+ },
+ ],
+};
+
+add_task(async function test() {
+ registerCleanupFunction(function () {
+ ss.setBrowserState(stateBackup);
+ });
+
+ /* This test fails by hanging. */
+ await setBrowserState(state);
+ ok(true, "Didn't hang!");
+});