--- a/toolkit/components/console/hudservice/HUDService.jsm
+++ b/toolkit/components/console/hudservice/HUDService.jsm
@@ -2187,28 +2187,30 @@ JSTerm.prototype = {
     this.sandbox.__proto__ = this._window.wrappedJSObject;
   },
 
   get _window()
   {
     return this.context.get().QueryInterface(Ci.nsIDOMWindowInternal);
   },
 
-  execute: function JST_execute()
+  execute: function JST_execute(aExecuteString)
   {
     // attempt to execute the content of the inputNode
-    var str = this.inputNode.value;
+    var str = aExecuteString || this.inputNode.value;
     if (!str) {
       this.console.log("no value to execute");
       return;
     }
+
+    this.writeOutput(str);
+
     try {
       var result =
       Cu.evalInSandbox(str, this.sandbox, "default", "HUD Console", 1);
-      this.writeOutput(str);
 
       if (result !== undefined) {
         this.writeOutput(result);
       }
     }
     catch (ex) {
       if (ex) {
         this.console.error(ex);
@@ -2231,16 +2233,25 @@ JSTerm.prototype = {
       node.setAttribute("class", "jsterm-output-line");
     }
     var textNode = this.textFactory(aOutputMessage);
     node.appendChild(textNode);
     this.outputNode.appendChild(node);
     node.scrollIntoView(false);
   },
 
+  clearOutput: function JST_clearOutput()
+  {
+    let outputNode = this.outputNode;
+
+    while (outputNode.firstChild) {
+      outputNode.removeChild(outputNode.firstChild);
+    }
+  },
+
   keyDown: function JSTF_keyDown(aEvent)
   {
     var self = this;
     function handleKeyDown(aEvent) {
       // ctrl-a
       var setTimeout = aEvent.target.ownerDocument.defaultView.setTimeout;
       var target = aEvent.target;
       var tmp;

--- a/toolkit/components/console/hudservice/tests/browser/browser_HUDServiceTestsAll.js
+++ b/toolkit/components/console/hudservice/tests/browser/browser_HUDServiceTestsAll.js
@@ -268,16 +268,37 @@ function testNet()
       "Found the loggged network message referencing a js file";
     var errMsg = "Could not get logged network message for js file";
     testLogEntry(outputNode,
                  "Network:", { success: successMsg, err: errMsg });
                  content.location.href = noCacheUriSpec(TEST_NETWORK_URI);
   });
 }
 
+function testOutputOrder()
+{
+  let HUD = HUDService.hudWeakReferences[hudId].get();
+  let jsterm = HUD.jsterm;
+  let outputNode = jsterm.outputNode;
+
+  jsterm.clearOutput();
+  jsterm.execute("console.log('foo', 'bar');");
+
+  is(outputNode.childNodes.length, 2, "Two children in output");
+  let outputChildren = outputNode.childNodes;
+
+  let executedStringFirst =
+    /console\.log\('foo', 'bar'\);/.test(outputChildren[0].childNodes[0].nodeValue);
+
+  let outputSecond =
+    /foo bar/.test(outputChildren[1].childNodes[0].nodeValue);
+
+  ok(executedStringFirst && outputSecond, "executed string comes first");
+}
+
 function testCreateDisplay() {
   ok(typeof cs.consoleDisplays == "object",
      "consoledisplays exist");
   ok(typeof cs.displayIndexes == "object",
      "console indexes exist");
   cs.createDisplay("foo");
   ok(typeof cs.consoleDisplays["foo"] == "object",
      "foo display exists");
@@ -447,16 +468,17 @@ function test() {
       testNet();
 
       // ConsoleStorageTests
       testCreateDisplay();
       testRecordEntry();
       testRecordManyEntries();
       testIteration();
       testConsoleHistory();
+      testOutputOrder();
 
       // testUnregister();
       executeSoon(function () {
         HUDService.deactivateHUDForContext(tab);
         HUDService.shutdown();
       });
       finish();
     });