1 files changed, 71 insertions, 0 deletions
diff --git a/layout/base/tests/browser_bug617076.js b/layout/base/tests/browser_bug617076.js
new file mode 100644
index 0000000000..c76cbd41d3
--- /dev/null
+++ b/layout/base/tests/browser_bug617076.js
@@ -0,0 +1,71 @@
+/**
+ * 1. load about:addons in a new tab and select that tab
+ * 2. insert a button with tooltiptext
+ * 3. create a new blank tab and select that tab
+ * 4. select the about:addons tab and hover the inserted button
+ * 5. remove the about:addons tab
+ * 6. remove the blank tab
+ *
+ * the test succeeds if it doesn't trigger any assertions
+ */
+
+add_task(async function test() {
+  // Open the test tab
+  let testTab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:addons"
+  );
+
+  // insert button into test page content
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], async function () {
+    let doc = content.document;
+    let e = doc.createXULElement("button");
+    e.setAttribute("label", "hello");
+    e.setAttribute("tooltiptext", "world");
+    e.setAttribute("id", "test-button");
+    doc.documentElement.insertBefore(e, doc.documentElement.firstChild);
+  });
+
+  // open a second tab and select it
+  let tab2 = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:blank",
+    true
+  );
+  gBrowser.selectedTab = tab2;
+
+  // Select the testTab then perform mouse events on inserted button
+  gBrowser.selectedTab = testTab;
+  let browser = gBrowser.selectedBrowser;
+  EventUtils.disableNonTestMouseEvents(true);
+  try {
+    await BrowserTestUtils.synthesizeMouse(
+      "#test-button",
+      1,
+      1,
+      { type: "mouseover" },
+      browser
+    );
+    await BrowserTestUtils.synthesizeMouse(
+      "#test-button",
+      2,
+      6,
+      { type: "mousemove" },
+      browser
+    );
+    await BrowserTestUtils.synthesizeMouse(
+      "#test-button",
+      2,
+      4,
+      { type: "mousemove" },
+      browser
+    );
+  } finally {
+    EventUtils.disableNonTestMouseEvents(false);
+  }
+
+  // cleanup
+  BrowserTestUtils.removeTab(testTab);
+  BrowserTestUtils.removeTab(tab2);
+  ok(true, "pass if no assertions");
+});