diff --git a/chrome/content/zotero/debugViewer.html b/chrome/content/zotero/debugViewer.html
index 35f9d0461..b7c6fa626 100644
--- a/chrome/content/zotero/debugViewer.html
+++ b/chrome/content/zotero/debugViewer.html
@@ -55,7 +55,7 @@
 				margin-top: 38px;
 				padding: 10px 9px;
 				font-family: Monaco, Consolas, Inconsolata, monospace;
-				font-size: 9pt;
+				font-size: 8pt;
 			}
 			
 			#errors {
diff --git a/chrome/content/zotero/debugViewer.js b/chrome/content/zotero/debugViewer.js
index 7672ec7b0..b9fb8b633 100644
--- a/chrome/content/zotero/debugViewer.js
+++ b/chrome/content/zotero/debugViewer.js
@@ -3,8 +3,18 @@
 var interval = 1000;
 var intervalID;
 var stopping = false;
+var scrolling = false;
+var autoscroll = true;
 
 function start() {
+	// If scrolled to the bottom of the page, stay there
+	document.body.onscroll = function (event) {
+		if (!scrolling) {
+			autoscroll = atPageBottom();
+		}
+		scrolling = false;
+	};
+	
 	updateErrors().then(function () {
 		if (stopping) return;
 		
@@ -31,13 +41,9 @@ function updateErrors() {
 		var errors = Zotero.getErrors(true);
 		var errorStr = errors.length ? errors.join('\n\n') + '\n\n' : '';
 		
-		var scroll = atPageBottom();
-		
 		document.getElementById('errors').textContent = errorStr + sysInfo;
 		
-		// TODO: This doesn't seem to work for some reason -- when errors are logged, it doesn't stay
-		// at the bottom
-		if (scroll) {
+		if (autoscroll) {
 			scrollToPageBottom();
 		}
 	});
@@ -50,15 +56,12 @@ function addInitialOutput() {
 }
 
 function addLine(line) {
-	var scroll = atPageBottom()
-	
 	var p = document.createElement('p');
 	p.textContent = line;
 	var output = document.getElementById('output');
 	output.appendChild(p);
 	
-	// If scrolled to the bottom of the page, stay there
-	if (scroll) {
+	if (autoscroll) {
 		scrollToPageBottom();
 	}
 	
@@ -71,6 +74,8 @@ function atPageBottom() {
 }
 
 function scrollToPageBottom() {
+	// Set a flag when auto-scrolling to differentiate from manual scrolls
+	scrolling = true;
 	window.scrollTo(0, document.body.scrollHeight);
 }
 
@@ -180,6 +185,7 @@ function clearSubmitStatus() {
 }
 
 function clearOutput(button) {
+	document.getElementById('submit-button').setAttribute('disabled', '');
 	button.setAttribute('disabled', '');
 	document.getElementById('output').textContent = '';
 	clearSubmitStatus();
diff --git a/chrome/content/zotero/xpcom/debug.js b/chrome/content/zotero/xpcom/debug.js
index 45898c0dc..6c7b0df00 100644
--- a/chrome/content/zotero/xpcom/debug.js
+++ b/chrome/content/zotero/xpcom/debug.js
@@ -151,6 +151,13 @@ Zotero.Debug = new function () {
 				}
 				// Console window
 				if (_consoleViewer) {
+					// Remove ANSI color codes. We could replace this with HTML, but it's probably
+					// unnecessarily distracting/alarming to show the red in the viewer. Devs who care
+					// about times should just use a terminal.
+					if (slowPrefix) {
+						output = output.replace(slowPrefix, '').replace(slowSuffix, '');
+					}
+					
 					// If there's a listener, pass line immediately
 					if (_consoleViewerListener) {
 						_consoleViewerListener(output);