diff --git a/packages/redux-devtools-inspector/demo/src/js/DemoApp.jsx b/packages/redux-devtools-inspector/demo/src/js/DemoApp.jsx
index 608b8748..c7f3e930 100644
--- a/packages/redux-devtools-inspector/demo/src/js/DemoApp.jsx
+++ b/packages/redux-devtools-inspector/demo/src/js/DemoApp.jsx
@@ -143,6 +143,9 @@ class DemoApp extends React.Component {
             <Button onClick={this.props.addRecursive} style={styles.button}>
               Add Recursive
             </Button>
+            <Button onClick={this.props.addNativeMap} style={styles.button}>
+              Add Native Map
+            </Button>
             <Button onClick={this.props.addImmutableMap} style={styles.button}>
               Add Immutable Map
             </Button>
@@ -230,6 +233,7 @@ export default connect(
     addIterator: () => ({ type: 'ADD_ITERATOR' }),
     addHugeObect: () => ({ type: 'ADD_HUGE_OBJECT' }),
     addRecursive: () => ({ type: 'ADD_RECURSIVE' }),
+    addNativeMap: () => ({ type: 'ADD_NATIVE_MAP' }),
     addImmutableMap: () => ({ type: 'ADD_IMMUTABLE_MAP' }),
     changeImmutableNested: () => ({ type: 'CHANGE_IMMUTABLE_NESTED' }),
     hugePayload: () => ({
diff --git a/packages/redux-devtools-inspector/demo/src/js/reducers.js b/packages/redux-devtools-inspector/demo/src/js/reducers.js
index 588b9eee..b944b352 100644
--- a/packages/redux-devtools-inspector/demo/src/js/reducers.js
+++ b/packages/redux-devtools-inspector/demo/src/js/reducers.js
@@ -25,6 +25,25 @@ const IMMUTABLE_MAP = Immutable.Map({
   seq: Immutable.Seq.of(1, 2, 3, 4, 5, 6, 7, 8)
 });
 
+const NATIVE_MAP = new window.Map([
+  ['map', new window.Map([
+    [{ first: true }, 1],
+    ['second', 2]
+  ])],
+  ['weakMap', new window.WeakMap([
+    [{ first: true }, 1],
+    [{ second: 1 }, 2]
+  ])],
+  ['set', new window.Set([
+    { first: true },
+    'second'
+  ])],
+  ['weakSet', new window.WeakSet([
+    { first: true },
+    { second: 1 }
+  ])]
+]);
+
 /* eslint-enable babel/new-cap */
 
 const HUGE_ARRAY = Array.from({ length: 5000 })
@@ -71,23 +90,24 @@ export default {
   iterators: (state=[], action) => action.type === 'ADD_ITERATOR' ?
     [...state, createIterator()] : state,
   nested: (state=NESTED, action) =>
-    action.type === 'CHANGE_NESTED' ?
-      {
-        ...state,
-        long: {
-          nested: [{
-            path: {
-              to: {
-                a: state.long.nested[0].path.to.a + '!'
-              }
+    action.type === 'CHANGE_NESTED' ? {
+      ...state,
+      long: {
+        nested: [{
+          path: {
+            to: {
+              a: state.long.nested[0].path.to.a + '!'
             }
-          }]
-        }
-      } : state,
+          }
+        }]
+      }
+    } : state,
   recursive: (state=[], action) => action.type === 'ADD_RECURSIVE' ?
     [...state, { ...RECURSIVE }] : state,
   immutables: (state=[], action) => action.type === 'ADD_IMMUTABLE_MAP' ?
     [...state, IMMUTABLE_MAP] : state,
+  maps: (state=[], action) => action.type === 'ADD_NATIVE_MAP' ?
+    [...state, NATIVE_MAP] : state,
   immutableNested: (state=IMMUTABLE_NESTED, action) => action.type === 'CHANGE_IMMUTABLE_NESTED' ?
     state.updateIn(
       ['long', 'nested', 0, 'path', 'to', 'a'],
@@ -96,7 +116,7 @@ export default {
   addFunction: (state=null, action) => action.type === 'ADD_FUNCTION' ?
     { f: FUNC } : state,
   addSymbol: (state=null, action) => action.type === 'ADD_SYMBOL' ?
-    { s: window.Symbol('symbol') } : state,
+    { s: window.Symbol('symbol'), error: new Error('TEST') } : state,
   shuffleArray: (state=DEFAULT_SHUFFLE_ARRAY, action) =>
     action.type === 'SHUFFLE_ARRAY' ?
       shuffle(state) : state
diff --git a/packages/redux-devtools-inspector/src/DevtoolsInspector.js b/packages/redux-devtools-inspector/src/DevtoolsInspector.js
index 7da39aff..d7dd7e7f 100644
--- a/packages/redux-devtools-inspector/src/DevtoolsInspector.js
+++ b/packages/redux-devtools-inspector/src/DevtoolsInspector.js
@@ -116,11 +116,11 @@ export default class DevtoolsInspector extends Component {
 
   componentDidMount() {
     this.updateSizeMode();
-    this.updateSizeTimeout = window.setInterval(this.updateSizeMode.bind(this), 150);
+    this.updateSizeTimeout = setInterval(this.updateSizeMode.bind(this), 150);
   }
 
   componentWillUnmount() {
-    window.clearTimeout(this.updateSizeTimeout);
+    clearTimeout(this.updateSizeTimeout);
   }
 
   updateMonitorState = monitorState => {