diff -r 000000000000 -r 6474c204b198 browser/devtools/profiler/test/browser_profiler_bug_834878_source_buttons.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/profiler/test/browser_profiler_bug_834878_source_buttons.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,33 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const BASE = "http://example.com/browser/browser/devtools/profiler/test/";
+const URL = BASE + "mock_profiler_bug_834878_page.html";
+const SCRIPT = BASE + "mock_profiler_bug_834878_script.js";
+
+function test() {
+  waitForExplicitFinish();
+
+  setUp(URL, function onSetUp(tab, browser, panel) {
+    let data = { uri: SCRIPT, line: 5, isChrome: false };
+
+    panel.displaySource(data).then(function onOpen() {
+      let target = TargetFactory.forTab(tab);
+      let dbg = gDevTools.getToolbox(target).getPanel("jsdebugger");
+      let view = dbg.panelWin.DebuggerView;
+
+      is(view.Sources.selectedValue, data.uri, "URI is different");
+      is(view.editor.getCursor().line, data.line - 1, "Line is different");
+
+      // Test the case where script is already loaded.
+      view.editor.setCursor({ line: 1, ch: 1 });
+      gDevTools.showToolbox(target, "jsprofiler").then(function () {
+        panel.displaySource(data).then(function onOpenAgain() {
+          is(view.editor.getCursor().line, data.line - 1,
+            "Line is different");
+          tearDown(tab);
+        });
+      });
+    });
+  });
+}