diff -r 000000000000 -r 6474c204b198 browser/devtools/framework/test/browser_toolbox_options_disable_cache.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/framework/test/browser_toolbox_options_disable_cache.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,113 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Tests that disabling JavaScript for a tab works as it should.
+
+const TEST_URI = "http://mochi.test:8888/browser/browser/devtools/framework/" +
+                 "test/browser_toolbox_options_disable_cache.sjs";
+
+let doc;
+let toolbox;
+
+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);
+    doc = content.document;
+    gDevTools.showToolbox(target).then(testSelectTool);
+  }, true);
+
+  content.location = TEST_URI;
+}
+
+function testSelectTool(aToolbox) {
+  toolbox = aToolbox;
+  toolbox.once("options-selected", testCacheEnabled);
+  toolbox.selectTool("options");
+}
+
+function testCacheEnabled() {
+  let prevTimestamp = getGUID();
+
+  gBrowser.selectedBrowser.addEventListener("load", function onLoad(evt) {
+    gBrowser.selectedBrowser.removeEventListener(evt.type, onLoad, true);
+    doc = content.document;
+    is(prevTimestamp, getGUID(), "GUID has not changed (page is cached)");
+
+    testCacheEnabled2();
+  }, true);
+
+  doc.location.reload(false);
+}
+
+function testCacheEnabled2() {
+  let prevTimestamp = getGUID();
+
+  gBrowser.selectedBrowser.addEventListener("load", function onLoad(evt) {
+    gBrowser.selectedBrowser.removeEventListener(evt.type, onLoad, true);
+    doc = content.document;
+    is(prevTimestamp, getGUID(),
+       "GUID has not changed after page refresh (page is cached)");
+
+    testCacheDisabled();
+  }, true);
+
+  doc.location.reload(false);
+}
+
+function testCacheDisabled() {
+  let prevTimestamp = getGUID();
+
+  let panel = toolbox.getCurrentPanel();
+  let cbx = panel.panelDoc.getElementById("devtools-disable-cache");
+  let browser = gBrowser.selectedBrowser;
+
+  browser.addEventListener("load", function onLoad(evt) {
+    browser.removeEventListener(evt.type, onLoad, true);
+    doc = content.document;
+    isnot(prevTimestamp, getGUID(), "GUID has changed (page is not cached)");
+    testCacheDisabled2();
+  }, true);
+
+  info("disabling cache");
+
+  cbx.scrollIntoView();
+
+  // After uising scrollIntoView() we need to use executeSoon() to wait for the
+  // browser to scroll.
+  executeSoon(function() {
+    EventUtils.synthesizeMouseAtCenter(cbx, {}, panel.panelWin);
+  });
+}
+
+function testCacheDisabled2() {
+  let prevTimestamp = getGUID();
+
+  let browser = gBrowser.selectedBrowser;
+
+  browser.addEventListener("load", function onLoad(evt) {
+    browser.removeEventListener(evt.type, onLoad, true);
+    doc = content.document;
+    isnot(prevTimestamp, getGUID(),
+       "GUID has changed after page refresh (page is not cached)");
+    finishUp();
+  }, true);
+
+  doc.location.reload(false);
+}
+
+function getGUID() {
+  return doc.querySelector("h1").textContent;
+}
+
+function finishUp() {
+  toolbox.destroy().then(() => {
+    gBrowser.removeCurrentTab();
+    toolbox = doc = null;
+    finish();
+  }).then(null, console.error);
+}