diff -r 000000000000 -r 6474c204b198 layout/xul/test/browser_bug703210.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/xul/test/browser_bug703210.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,72 @@
+function test() {
+  waitForExplicitFinish();
+
+  gBrowser.selectedTab = gBrowser.addTab();
+
+  SpecialPowers.setIntPref("ui.tooltipDelay", 0);
+
+  let doStopPropagation = function (aEvent)
+  {
+    aEvent.stopPropagation();
+  }
+
+  let onPopupShown = function (aEvent)
+  {
+    is(aEvent.originalTarget.localName, "tooltip", "tooltip is showing");
+
+    let doc = gBrowser.contentDocument;
+    let win = gBrowser.contentWindow;
+    let p2 = doc.getElementById("p2");
+    setTimeout(function () {
+      EventUtils.synthesizeMouseAtCenter(p2, { type: "mousemove" }, win); }, 0);
+  }
+
+  let onPopupHiding = function (aEvent)
+  {
+    is(aEvent.originalTarget.localName, "tooltip", "tooltip is hiding");
+
+    let doc = gBrowser.contentDocument;
+
+    doc.removeEventListener("mousemove", doStopPropagation, true);
+    doc.removeEventListener("mouseenter", doStopPropagation, true);
+    doc.removeEventListener("mouseleave", doStopPropagation, true);
+    doc.removeEventListener("mouseover", doStopPropagation, true);
+    doc.removeEventListener("mouseout", doStopPropagation, true);
+    document.removeEventListener("popupshown", onPopupShown, true);
+    document.removeEventListener("popuphiding", onPopupHiding, true);
+
+    SpecialPowers.clearUserPref("ui.tooltipDelay");
+
+    gBrowser.removeCurrentTab();
+    finish();
+  }
+
+  let onLoad = function (aEvent)
+  {
+    let doc = gBrowser.contentDocument;
+    let win = gBrowser.contentWindow;
+    let p1 = doc.getElementById("p1");
+    let p2 = doc.getElementById("p2");
+
+    EventUtils.synthesizeMouseAtCenter(p2, { type: "mousemove" }, win);
+
+    doc.addEventListener("mousemove", doStopPropagation, true);
+    doc.addEventListener("mouseenter", doStopPropagation, true);
+    doc.addEventListener("mouseleave", doStopPropagation, true);
+    doc.addEventListener("mouseover", doStopPropagation, true);
+    doc.addEventListener("mouseout", doStopPropagation, true);
+    document.addEventListener("popupshown", onPopupShown, true);
+    document.addEventListener("popuphiding", onPopupHiding, true);
+
+    EventUtils.synthesizeMouseAtCenter(p1, { type: "mousemove" }, win);
+  }
+
+  gBrowser.selectedBrowser.addEventListener("load", function loadListener() {
+    gBrowser.selectedBrowser.removeEventListener("load", loadListener, true);
+    setTimeout(onLoad, 0);
+  }, true);
+
+  content.location = "data:text/html," +
+    "<p id=\"p1\" title=\"tooltip is here\">This paragraph has a tooltip.</p>" +
+    "<p id=\"p2\">This paragraph doesn't have tooltip.</p>";
+}