diff -r 000000000000 -r 6474c204b198 browser/devtools/scratchpad/test/browser_scratchpad_chrome_context_pref.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/scratchpad/test/browser_scratchpad_chrome_context_pref.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,52 @@
+/* vim: set ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+/* Bug 646070 */
+
+let DEVTOOLS_CHROME_ENABLED = "devtools.chrome.enabled";
+
+function test()
+{
+  waitForExplicitFinish();
+
+  Services.prefs.setBoolPref(DEVTOOLS_CHROME_ENABLED, true);
+
+  gBrowser.selectedTab = gBrowser.addTab();
+  gBrowser.selectedBrowser.addEventListener("load", function onLoad() {
+    gBrowser.selectedBrowser.removeEventListener("load", onLoad, true);
+
+    ok(window.Scratchpad, "Scratchpad variable exists");
+
+    openScratchpad(runTests);
+  }, true);
+
+  content.location = "data:text/html,Scratchpad test for bug 646070 - chrome context preference";
+}
+
+function runTests()
+{
+  let sp = gScratchpadWindow.Scratchpad;
+  ok(sp, "Scratchpad object exists in new window");
+
+  let environmentMenu = gScratchpadWindow.document.
+                          getElementById("sp-environment-menu");
+  ok(environmentMenu, "Environment menu element exists");
+  ok(!environmentMenu.hasAttribute("hidden"),
+     "Environment menu is visible");
+
+  let errorConsoleCommand = gScratchpadWindow.document.
+                            getElementById("sp-cmd-errorConsole");
+  ok(errorConsoleCommand, "Error console command element exists");
+  ok(!errorConsoleCommand.hasAttribute("disabled"),
+     "Error console command is enabled");
+
+  let chromeContextCommand = gScratchpadWindow.document.
+                            getElementById("sp-cmd-browserContext");
+  ok(chromeContextCommand, "Chrome context command element exists");
+  ok(!chromeContextCommand.hasAttribute("disabled"),
+     "Chrome context command is disabled");
+
+  Services.prefs.clearUserPref(DEVTOOLS_CHROME_ENABLED);
+
+  finish();
+}