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diff --git a/comm/suite/components/places/tests/chrome/test_bug549491.xul b/comm/suite/components/places/tests/chrome/test_bug549491.xul
new file mode 100644
index 0000000000..f211d62fd2
--- /dev/null
+++ b/comm/suite/components/places/tests/chrome/test_bug549491.xul
@@ -0,0 +1,100 @@
+<?xml version="1.0"?>
+
+<!--
+    Any copyright is dedicated to the Public Domain.
+    http://creativecommons.org/licenses/publicdomain/
+   -->
+
+<?xml-stylesheet href="chrome://global/skin" type="text/css"?>
+<?xml-stylesheet href="chrome://mochikit/content/tests/SimpleTest/test.css"
+                 type="text/css"?>
+
+<?xml-stylesheet href="chrome://communicator/content/places/places.css"?>
+<?xml-stylesheet href="chrome://communicator/skin/places/organizer.css"?>
+<?xul-overlay href="chrome://communicator/content/places/placesOverlay.xul"?>
+
+<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        title="549491: 'The root node is never visible' exception when details of the root node are modified "
+        onload="runTest();">
+
+  <script src="chrome://mochikit/content/MochiKit/packed.js" />
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js" />
+  <script src="head.js" />
+
+  <body xmlns="http://www.w3.org/1999/xhtml" />
+
+  <tree id="tree"
+        type="places"
+        flatList="true"
+        flex="1">
+    <treecols>
+      <treecol label="Title" id="title" anonid="title" primary="true" ordinal="1" flex="1"/>
+      <splitter class="tree-splitter"/>
+      <treecol label="Date" anonid="date" flex="1"/>
+    </treecols>
+    <treechildren flex="1"/>
+  </tree>
+
+  <script>
+  <![CDATA[
+    /**
+     * Bug 549491
+     * https://bugzilla.mozilla.org/show_bug.cgi?id=549491
+     *
+     * Ensures that changing the details of places tree's root-node doesn't
+     * throw.
+     */
+      const {Services} = ChromeUtils.import("resource://gre/modules/Services.jsm");
+
+    SimpleTest.waitForExplicitFinish();
+
+    function runTest() {
+      // The mochitest page is added to history.
+      waitForClearHistory(continue_test);
+    }
+
+    function continue_test() {
+      addVisits(
+        {uri: Services.io.newURI("http://example.tld/"),
+         visitDate: Date.now() * 1000,
+         transition: PlacesUtils.history.TRANSITION_TYPED},
+        function() {
+          // Make a history query.
+          let query = PlacesUtils.history.getNewQuery();
+          let opts = PlacesUtils.history.getNewQueryOptions();
+          let queryURI = PlacesUtils.history.queriesToQueryString([query], 1, opts);
+
+          // Setup the places tree contents.
+          let tree = document.getElementById("tree");
+          tree.place = queryURI;
+
+          let rootNode = tree.result.root;
+          let obs = tree.view.QueryInterface(Ci.nsINavHistoryResultObserver);
+          obs.nodeHistoryDetailsChanged(rootNode, rootNode.time, rootNode.accessCount);
+          obs.nodeTitleChanged(rootNode, rootNode.title);
+          ok(true, "No exceptions thrown");
+
+          // Cleanup.
+          waitForClearHistory(SimpleTest.finish);
+        });
+    }
+
+    /**
+     * Clears history invoking callback when done.
+     */
+    function waitForClearHistory(aCallback) {
+      const TOPIC_EXPIRATION_FINISHED = "places-expiration-finished";
+      let observer = {
+        observe: function(aSubject, aTopic, aData) {
+          Services.obs.removeObserver(this, TOPIC_EXPIRATION_FINISHED);
+          aCallback();
+        }
+      };
+      Services.obs.addObserver(observer, TOPIC_EXPIRATION_FINISHED);
+      let hs = Cc["@mozilla.org/browser/nav-history-service;1"].
+               getService(Ci.nsINavHistoryService);
+      hs.QueryInterface(Ci.nsIBrowserHistory).removeAllPages();
+   }
+
+  ]]></script>
+</window>