add settings for replace tab.

src/eventPage.js

@@ -5,9 +5,15 @@ chrome.browserAction.onClicked.addListener(function(){
 	});
 });
 
+// Listen for tabs getting created.
 chrome.tabs.onCreated.addListener(function (tab) {
-	console.log('created', arguments)
+	// If a new tab is opened (without any URL), check user's
+	// replace Tab setting and act accordingly.
 	if (tab.url === 'chrome://newtab/') {
+		chrome.storage.sync.get({
+			replaceNewTab: true
+		}, function(items) {
+			if (items.replaceNewTab) {
 				chrome.tabs.update(tab.id, {
 					url: chrome.extension.getURL('index.html')
 				}, function callback() {
@@ -15,7 +21,5 @@ chrome.tabs.onCreated.addListener(function (tab) {
 				});
 			}
 		});
-
-chrome.tabs.onUpdated.addListener(function () {
-	console.log('updated', arguments)
+	}
 });

src/options.html

@@ -35,6 +35,11 @@
 			Preserve last written code
 		</label>
 
+		<label>
+			<input type="checkbox" name="replaceNewTab">
+			Replace new tab page
+		</label>
+
 		<div id="js-status" class="status">&nbsp;</div>
 		<button id="js-save-btn" class="btn">Save</button>
 	</form>

src/options.js

@@ -1,17 +1,21 @@
 // Restores preferences from chrome.storage.
 function restoreOptions() {
 	chrome.storage.sync.get({
-		preserveLastCode: true
+		preserveLastCode: true,
+		replaceNewTab: true
 	}, function(items) {
 		document.forms.optionsForm.preserveLastCode.checked = items.preserveLastCode;
+		document.forms.optionsForm.replaceNewTab.checked = items.replaceNewTab;
 	});
 }
 
 function saveOptions(e) {
 	var preserveLastCode = document.forms.optionsForm.preserveLastCode.checked;
+	var replaceNewTab = document.forms.optionsForm.replaceNewTab.checked;
 
 	chrome.storage.sync.set({
-		preserveLastCode: preserveLastCode
+		preserveLastCode: preserveLastCode,
+		replaceNewTab: replaceNewTab
 	}, function() {
 		var status = document.getElementById('js-status');
 		status.textContent = 'Settings saved.';