diff -r 000000000000 -r 6474c204b198 browser/devtools/framework/test/browser_toolbox_ready.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/framework/test/browser_toolbox_ready.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,43 @@
+/* vim: set ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test()
+{
+  waitForExplicitFinish();
+
+  gBrowser.selectedTab = gBrowser.addTab();
+  let target = TargetFactory.forTab(gBrowser.selectedTab);
+
+  gBrowser.selectedBrowser.addEventListener("load", function onLoad(evt) {
+    gBrowser.selectedBrowser.removeEventListener(evt.type, onLoad, true);
+    gDevTools.showToolbox(target).then(testReady);
+  }, true);
+
+  content.location = "data:text/html,test for dynamically registering and unregistering tools";
+}
+
+function testReady(toolbox)
+{
+  ok(toolbox.isReady, "toolbox isReady is set");
+  testDouble(toolbox);
+}
+
+function testDouble(toolbox)
+{
+  let target = toolbox.target;
+  let toolId = toolbox.currentToolId;
+
+  gDevTools.showToolbox(target, toolId).then(function(toolbox2) {
+    is(toolbox2, toolbox, "same toolbox");
+    cleanup(toolbox);
+  });
+}
+
+function cleanup(toolbox)
+{
+  toolbox.destroy().then(function() {
+    gBrowser.removeCurrentTab();
+    finish();
+  });
+}