diff --git a/src/components/CodeEditor.jsx b/src/components/CodeEditor.jsx
index 74be5fd..0437bef 100644
--- a/src/components/CodeEditor.jsx
+++ b/src/components/CodeEditor.jsx
@@ -69,7 +69,9 @@ export default class CodeEditor extends Component {
 			const { prefs } = nextProps;
 
 			if (this.props.type === 'monaco') {
-				this.instance.updateOptions({ fontSize: prefs.fontSize });
+				this.editorReadyDeferred.promise.then(() => {
+					this.instance.updateOptions({ fontSize: prefs.fontSize });
+				});
 			} else {
 				this.instance.setOption(
 					'indentWithTabs',
diff --git a/src/components/ContentWrap.jsx b/src/components/ContentWrap.jsx
index 26cb89c..aca07d2 100644
--- a/src/components/ContentWrap.jsx
+++ b/src/components/ContentWrap.jsx
@@ -715,7 +715,13 @@ export default class ContentWrap extends Component {
 							</div>
 						</div>
 						<CodeEditor
-							type={this.props.prefs.isMonacoEditorOn ? 'monaco' : 'codemirror'}
+							type={
+								window.forcedSettings.isMonacoEditorOn === true ||
+								(this.props.prefs.isMonacoEditorOn &&
+									window.forcedSettings.isMonacoEditorOn !== false)
+									? 'monaco'
+									: 'codemirror'
+							}
 							options={{
 								mode: 'htmlmixed',
 								profile: 'xhtml',
@@ -792,7 +798,13 @@ export default class ContentWrap extends Component {
 							</div>
 						</div>
 						<CodeEditor
-							type={this.props.prefs.isMonacoEditorOn ? 'monaco' : 'codemirror'}
+							type={
+								window.forcedSettings.isMonacoEditorOn === true ||
+								(this.props.prefs.isMonacoEditorOn &&
+									window.forcedSettings.isMonacoEditorOn !== false)
+									? 'monaco'
+									: 'codemirror'
+							}
 							options={{
 								mode: 'css',
 								gutters: [
@@ -857,7 +869,13 @@ export default class ContentWrap extends Component {
 							</div>
 						</div>
 						<CodeEditor
-							type={this.props.prefs.isMonacoEditorOn ? 'monaco' : 'codemirror'}
+							type={
+								window.forcedSettings.isMonacoEditorOn === true ||
+								(this.props.prefs.isMonacoEditorOn &&
+									window.forcedSettings.isMonacoEditorOn !== false)
+									? 'monaco'
+									: 'codemirror'
+							}
 							options={{
 								mode: 'javascript',
 								gutters: [
diff --git a/src/components/app.jsx b/src/components/app.jsx
index a7c0304..0d75f00 100644
--- a/src/components/app.jsx
+++ b/src/components/app.jsx
@@ -79,6 +79,21 @@ const LocalStorageKeys = {
 const UNSAVED_WARNING_COUNT = 15;
 const version = '4.0.1';
 
+// Read forced settings as query parameters
+window.forcedSettings = {};
+if (location.search) {
+	let match = location.search.replace(/^\?/, '').match(/settings=([^=]*)/);
+	if (match) {
+		match = match[1];
+		match.split(',').map(pair => {
+			pair = pair.split(':');
+			if (pair[1] === 'true') pair[1] = true;
+			else if (pair[1] === 'false') pair[1] = false;
+			window.forcedSettings[pair[0]] = pair[1];
+		});
+	}
+}
+
 export default class App extends Component {
 	constructor() {
 		super();