diff -r 000000000000 -r 6474c204b198 browser/devtools/framework/test/browser_toolbox_window_title_changes.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/framework/test/browser_toolbox_window_title_changes.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,84 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+let Toolbox = devtools.Toolbox;
+let temp = {};
+Cu.import("resource://gre/modules/Services.jsm", temp);
+let Services = temp.Services;
+temp = null;
+
+function test() {
+  waitForExplicitFinish();
+
+  const URL_1 = "data:text/plain;charset=UTF-8,abcde";
+  const URL_2 = "data:text/plain;charset=UTF-8,12345";
+
+  const TOOL_ID_1 = "webconsole";
+  const TOOL_ID_2 = "jsdebugger";
+
+  const LABEL_1 = "Console";
+  const LABEL_2 = "Debugger";
+
+  let toolbox;
+
+  addTab(URL_1, function () {
+    let target = TargetFactory.forTab(gBrowser.selectedTab);
+    gDevTools.showToolbox(target, null, Toolbox.HostType.BOTTOM)
+      .then(function (aToolbox) { toolbox = aToolbox; })
+      .then(function () toolbox.selectTool(TOOL_ID_1))
+
+    // undock toolbox and check title
+      .then(function () toolbox.switchHost(Toolbox.HostType.WINDOW))
+      .then(checkTitle.bind(null, LABEL_1, URL_1, "toolbox undocked"))
+
+    // switch to different tool and check title
+      .then(function () toolbox.selectTool(TOOL_ID_2))
+      .then(checkTitle.bind(null, LABEL_2, URL_1, "tool changed"))
+
+    // navigate to different url and check title
+      .then(function () {
+        let deferred = promise.defer();
+        target.once("navigate", function () deferred.resolve());
+        gBrowser.loadURI(URL_2);
+        return deferred.promise;
+      })
+      .then(checkTitle.bind(null, LABEL_2, URL_2, "url changed"))
+
+    // destroy toolbox, create new one hosted in a window (with a
+    // different tool id), and check title
+      .then(function () {
+        // Give the tools a chance to handle the navigation event before
+        // destroying the toolbox.
+        executeSoon(function() {
+          toolbox.destroy()
+            .then(function () {
+              // After destroying the toolbox, a fresh target is required.
+              target = TargetFactory.forTab(gBrowser.selectedTab);
+              return gDevTools.showToolbox(target, null, Toolbox.HostType.WINDOW);
+            })
+            .then(function (aToolbox) { toolbox = aToolbox; })
+            .then(function () toolbox.selectTool(TOOL_ID_1))
+            .then(checkTitle.bind(null, LABEL_1, URL_2,
+                                  "toolbox destroyed and recreated"))
+
+            // clean up
+            .then(function () toolbox.destroy())
+            .then(function () {
+              toolbox = null;
+              gBrowser.removeCurrentTab();
+              Services.prefs.clearUserPref("devtools.toolbox.host");
+              Services.prefs.clearUserPref("devtools.toolbox.selectedTool");
+              Services.prefs.clearUserPref("devtools.toolbox.sideEnabled");
+              finish();
+            });
+        });
+      });
+  });
+}
+
+function checkTitle(toolLabel, url, context) {
+  let win = Services.wm.getMostRecentWindow("devtools:toolbox");
+  let definitions = gDevTools.getToolDefinitionMap();
+  let expectedTitle = toolLabel + " - " + url;
+  is(win.document.title, expectedTitle, context);
+}