diff -r 000000000000 -r 6474c204b198 browser/devtools/webconsole/test/browser_webconsole_bug_613642_maintain_scroll.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/webconsole/test/browser_webconsole_bug_613642_maintain_scroll.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,128 @@
+/* vim:set ts=2 sw=2 sts=2 et: */
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ *
+ * Contributor(s):
+ *   Mihai Șucan <mihai.sucan@gmail.com>
+ */
+
+let hud, testDriver;
+
+function testNext() {
+  testDriver.next();
+}
+
+function testGen() {
+  hud.jsterm.clearOutput();
+  let outputNode = hud.outputNode;
+  let scrollBox = outputNode.parentNode;
+
+  for (let i = 0; i < 150; i++) {
+    content.console.log("test message " + i);
+  }
+
+  waitForMessages({
+    webconsole: hud,
+    messages: [{
+      text: "test message 149",
+      category: CATEGORY_WEBDEV,
+      severity: SEVERITY_LOG,
+    }],
+  }).then(testNext);
+
+  yield undefined;
+
+  ok(scrollBox.scrollTop > 0, "scroll location is not at the top");
+
+  // scroll to the first node
+  outputNode.focus();
+
+  scrollBox.onscroll = () => {
+    info("onscroll top " + scrollBox.scrollTop);
+    if (scrollBox.scrollTop != 0) {
+      // Wait for scroll to 0.
+      return;
+    }
+    scrollBox.onscroll = null;
+    is(scrollBox.scrollTop, 0, "scroll location updated (moved to top)");
+    testNext();
+  };
+  EventUtils.synthesizeKey("VK_HOME", {}, hud.iframeWindow);
+
+  yield undefined;
+
+  // add a message and make sure scroll doesn't change
+  content.console.log("test message 150");
+
+  waitForMessages({
+    webconsole: hud,
+    messages: [{
+      text: "test message 150",
+      category: CATEGORY_WEBDEV,
+      severity: SEVERITY_LOG,
+    }],
+  }).then(testNext);
+
+  yield undefined;
+
+  scrollBox.onscroll = () => {
+    if (scrollBox.scrollTop != 0) {
+      // Wait for scroll to stabilize at the top.
+      return;
+    }
+    scrollBox.onscroll = null;
+    is(scrollBox.scrollTop, 0, "scroll location is still at the top");
+    testNext();
+  };
+
+  // Make sure that scroll stabilizes at the top. executeSoon() is needed for
+  // the yield to work.
+  executeSoon(scrollBox.onscroll);
+
+  yield undefined;
+
+  // scroll back to the bottom
+  outputNode.lastChild.focus();
+
+  scrollBox.onscroll = () => {
+    if (scrollBox.scrollTop == 0) {
+      // Wait for scroll to bottom.
+      return;
+    }
+    scrollBox.onscroll = null;
+    isnot(scrollBox.scrollTop, 0, "scroll location updated (moved to bottom)");
+    testNext();
+  };
+  EventUtils.synthesizeKey("VK_END", {});
+  yield undefined;
+
+  let oldScrollTop = scrollBox.scrollTop;
+
+  content.console.log("test message 151");
+
+  scrollBox.onscroll = () => {
+    if (scrollBox.scrollTop == oldScrollTop) {
+      // Wait for scroll to change.
+      return;
+    }
+    scrollBox.onscroll = null;
+    isnot(scrollBox.scrollTop, oldScrollTop, "scroll location updated (moved to bottom again)");
+    hud = testDriver = null;
+    finishTest();
+  };
+
+  yield undefined;
+}
+
+function test() {
+  addTab("data:text/html;charset=utf-8,Web Console test for bug 613642: remember scroll location");
+  browser.addEventListener("load", function tabLoad(aEvent) {
+    browser.removeEventListener(aEvent.type, tabLoad, true);
+    openConsole(null, function(aHud) {
+      hud = aHud;
+      testDriver = testGen();
+      testDriver.next();
+    });
+  }, true);
+}