diff -r 000000000000 -r 6474c204b198 browser/devtools/webconsole/test/browser_console_addonsdk_loader_exception.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/webconsole/test/browser_console_addonsdk_loader_exception.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,88 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+// Check that exceptions from scripts loaded with the addon-sdk loader are
+// opened correctly in View Source from the Browser Console.
+// See bug 866950.
+
+const TEST_URI = "data:text/html;charset=utf8,<p>hello world from bug 866950";
+
+function test()
+{
+  requestLongerTimeout(2);
+
+  let webconsole, browserconsole;
+
+  Task.spawn(runner).then(finishTest);
+
+  function* runner() {
+    let {tab} = yield loadTab(TEST_URI);
+    webconsole = yield openConsole(tab);
+    ok(webconsole, "web console opened");
+
+    browserconsole = yield HUDService.toggleBrowserConsole();
+    ok(browserconsole, "browser console opened");
+
+    // Cause an exception in a script loaded with the addon-sdk loader.
+    let toolbox = gDevTools.getToolbox(webconsole.target);
+    let oldPanels = toolbox._toolPanels;
+    toolbox._toolPanels = null;
+
+    function fixToolbox() {
+      toolbox._toolPanels = oldPanels;
+    }
+
+    info("generate exception and wait for message");
+
+    executeSoon(() => {
+      executeSoon(fixToolbox);
+      expectUncaughtException();
+      toolbox.getToolPanels();
+    });
+
+    let [result] = yield waitForMessages({
+      webconsole: browserconsole,
+      messages: [{
+        text: "TypeError: can't convert null to object",
+        category: CATEGORY_JS,
+        severity: SEVERITY_ERROR,
+      }],
+    });
+
+    fixToolbox();
+
+    let msg = [...result.matched][0];
+    ok(msg, "message element found");
+    let locationNode = msg.querySelector(".message-location");
+    ok(locationNode, "message location element found");
+
+    let title = locationNode.getAttribute("title");
+    info("location node title: " + title);
+    isnot(title.indexOf(" -> "), -1, "error comes from a subscript");
+
+    let viewSource = browserconsole.viewSource;
+    let URL = null;
+    let clickPromise = promise.defer();
+    browserconsole.viewSource = (aURL) => {
+      info("browserconsole.viewSource() was invoked: " + aURL);
+      URL = aURL;
+      clickPromise.resolve(null);
+    };
+
+    msg.scrollIntoView();
+    EventUtils.synthesizeMouse(locationNode, 2, 2, {},
+                               browserconsole.iframeWindow);
+
+    info("wait for click on locationNode");
+    yield clickPromise;
+
+    info("view-source url: " + URL);
+    ok(URL, "we have some source URL after the click");
+    isnot(URL.indexOf("toolbox.js"), -1, "we have the expected view source URL");
+    is(URL.indexOf("->"), -1, "no -> in the URL given to view-source");
+
+    browserconsole.viewSource = viewSource;
+  }
+}