diff --git a/app/scripts/controllers/preferences.js b/app/scripts/controllers/preferences.js
index 0aed4dbdf..0dd9eae1b 100644
--- a/app/scripts/controllers/preferences.js
+++ b/app/scripts/controllers/preferences.js
@@ -10,6 +10,7 @@ class PreferencesController {
       currentAccountTab: 'history',
       tokens: [],
       useBlockie: false,
+      featureFlags: {},
     }, opts.initState)
     this.store = new ObservableStore(initState)
   }
@@ -100,6 +101,22 @@ class PreferencesController {
   getFrequentRpcList () {
     return this.store.getState().frequentRpcList
   }
+
+  setFeatureFlag (feature, activated) {
+    const currentFeatureFlags = this.store.getState().featureFlags
+    const updatedFeatureFlags = {
+      ...currentFeatureFlags,
+      [feature]: activated,
+    }
+
+    this.store.updateState({ featureFlags: updatedFeatureFlags })
+    console.log(`!!! updatedFeatureFlags`, updatedFeatureFlags);
+    return Promise.resolve(updatedFeatureFlags)
+  }
+
+  getFeatureFlags () {
+    return this.store.getState().featureFlags
+  }
   //
   // PRIVATE METHODS
   //
diff --git a/app/scripts/metamask-controller.js b/app/scripts/metamask-controller.js
index 4dce89e3a..8966ba393 100644
--- a/app/scripts/metamask-controller.js
+++ b/app/scripts/metamask-controller.js
@@ -341,6 +341,7 @@ module.exports = class MetamaskController extends EventEmitter {
       addToken: nodeify(preferencesController.addToken, preferencesController),
       removeToken: nodeify(preferencesController.removeToken, preferencesController),
       setCurrentAccountTab: nodeify(preferencesController.setCurrentAccountTab, preferencesController),
+      setFeatureFlag: nodeify(preferencesController.setFeatureFlag, preferencesController),
 
       // AddressController
       setAddressBook: nodeify(addressBookController.setAddressBook, addressBookController),
diff --git a/app/scripts/popup.js b/app/scripts/popup.js
index 5f17f0651..8cef06931 100644
--- a/app/scripts/popup.js
+++ b/app/scripts/popup.js
@@ -12,6 +12,7 @@ const notificationManager = new NotificationManager()
 global.platform = new ExtensionPlatform()
 
 // inject css
+console.log(`MetaMaskUiCss`, MetaMaskUiCss);
 const css = MetaMaskUiCss()
 injectCss(css)
 
diff --git a/old-ui/app/app.js b/old-ui/app/app.js
index e3f72793c..dcf19a0a9 100644
--- a/old-ui/app/app.js
+++ b/old-ui/app/app.js
@@ -93,31 +93,32 @@ App.prototype.render = function () {
   log.debug('Main ui render function')
 
   return (
-
-    h('.flex-column.full-height', {
-      style: {
-        // Windows was showing a vertical scroll bar:
-        overflow: 'hidden',
-        position: 'relative',
-        alignItems: 'center',
-      },
-    }, [
-
-      // app bar
-      this.renderAppBar(),
-      this.renderNetworkDropdown(),
-      this.renderDropdown(),
-
-      this.renderLoadingIndicator({ isLoading, isLoadingNetwork, loadMessage }),
-
-      // panel content
-      h('.app-primary' + (transForward ? '.from-right' : '.from-left'), {
+    h('.old-ui', [
+      h('.flex-column.full-height', {
         style: {
-          width: '100%',
+          // Windows was showing a vertical scroll bar:
+          overflow: 'hidden',
+          position: 'relative',
+          alignItems: 'center',
         },
       }, [
-        this.renderPrimary(),
-      ]),
+
+        // app bar
+        this.renderAppBar(),
+        this.renderNetworkDropdown(),
+        this.renderDropdown(),
+
+        this.renderLoadingIndicator({ isLoading, isLoadingNetwork, loadMessage }),
+
+        // panel content
+        h('.app-primary' + (transForward ? '.from-right' : '.from-left'), {
+          style: {
+            width: '100%',
+          },
+        }, [
+          this.renderPrimary(),
+        ]),
+      ])
     ])
   )
 }
diff --git a/ui/app/actions.js b/ui/app/actions.js
index e79f4373e..745b8779e 100644
--- a/ui/app/actions.js
+++ b/ui/app/actions.js
@@ -237,6 +237,11 @@ var actions = {
 
   SET_USE_BLOCKIE: 'SET_USE_BLOCKIE',
   setUseBlockie,
+  
+  // Feature Flags
+  setFeatureFlag,
+  updateFeatureFlags,
+  UPDATE_FEATURE_FLAGS: 'UPDATE_FEATURE_FLAGS',
 }
 
 module.exports = actions
@@ -1506,6 +1511,30 @@ function updateTokenExchangeRate (token = '') {
   }
 }
 
+function setFeatureFlag (feature, activated) {
+  return (dispatch) => {
+    dispatch(actions.showLoadingIndication())
+    return new Promise((resolve, reject) => {
+      background.setFeatureFlag(feature, activated, (err, updatedFeatureFlags) => {
+        dispatch(actions.hideLoadingIndication())
+        if (err) {
+          dispatch(actions.displayWarning(err.message))
+          reject(err)
+        }
+        dispatch(actions.updateFeatureFlags(updatedFeatureFlags))
+        resolve(updatedFeatureFlags)
+      })
+    })
+  }
+}
+
+function updateFeatureFlags (updatedFeatureFlags) {
+  return {
+    type: actions.UPDATE_FEATURE_FLAGS,
+    value: updatedFeatureFlags,
+  }
+}
+
 // Call Background Then Update
 //
 // A function generator for a common pattern wherein:
diff --git a/ui/app/app.js b/ui/app/app.js
index e90c3e98e..7e1eb200f 100644
--- a/ui/app/app.js
+++ b/ui/app/app.js
@@ -116,40 +116,41 @@ App.prototype.render = function () {
   log.debug('Main ui render function')
 
   return (
+    h('.new-ui', [
+      h('.flex-column.full-height', {
+        style: {
+          overflowX: 'hidden',
+          position: 'relative',
+          alignItems: 'center',
+        },
+      }, [
 
-    h('.flex-column.full-height', {
-      style: {
-        overflowX: 'hidden',
-        position: 'relative',
-        alignItems: 'center',
-      },
-    }, [
+        // global modal
+        h(Modal, {}, []),
 
-      // global modal
-      h(Modal, {}, []),
+        // app bar
+        this.renderAppBar(),
 
-      // app bar
-      this.renderAppBar(),
+        // sidebar
+        this.renderSidebar(),
 
-      // sidebar
-      this.renderSidebar(),
+        // network dropdown
+        h(NetworkDropdown, {
+          provider: this.props.provider,
+          frequentRpcList: this.props.frequentRpcList,
+        }, []),
 
-      // network dropdown
-      h(NetworkDropdown, {
-        provider: this.props.provider,
-        frequentRpcList: this.props.frequentRpcList,
-      }, []),
+        h(AccountMenu),
 
-      h(AccountMenu),
+        (isLoading || isLoadingNetwork) && h(Loading, {
+          loadingMessage: loadMessage,
+        }),
 
-      (isLoading || isLoadingNetwork) && h(Loading, {
-        loadingMessage: loadMessage,
-      }),
+        // this.renderLoadingIndicator({ isLoading, isLoadingNetwork, loadMessage }),
 
-      // this.renderLoadingIndicator({ isLoading, isLoadingNetwork, loadMessage }),
-
-      // content
-      this.renderPrimary(),
+        // content
+        this.renderPrimary(),
+      ])
     ])
   )
 }
@@ -268,6 +269,13 @@ App.prototype.renderAppBar = function () {
               },
             }, 'MetaMask'),
 
+            h('span', {
+              style: {},
+              onClick: () => {
+                props.dispatch(actions.setFeatureFlag('betaUI', false))
+              },
+            }, 'Leave Beta')
+
           ]),
 
           h('div.header__right-actions', [
diff --git a/ui/app/css/index.scss b/ui/app/css/index.scss
index 01899ccad..445c819ff 100644
--- a/ui/app/css/index.scss
+++ b/ui/app/css/index.scss
@@ -4,6 +4,7 @@
   http://www.creativebloq.com/web-design/manage-large-css-projects-itcss-101517528
   https://www.xfive.co/blog/itcss-scalable-maintainable-css-architecture/
  */
+
 @import './itcss/settings/index.scss';
 @import './itcss/tools/index.scss';
 @import './itcss/generic/index.scss';
diff --git a/ui/app/css/itcss/components/menu.scss b/ui/app/css/itcss/components/menu.scss
index 17e24de98..77c49bbcf 100644
--- a/ui/app/css/itcss/components/menu.scss
+++ b/ui/app/css/itcss/components/menu.scss
@@ -11,7 +11,7 @@
     flex-flow: row nowrap;
     align-items: center;
     position: relative;
-    z-index: 200;
+    z-index: 201;
     font-weight: 200;
 
     @media screen and (max-width: 575px) {
diff --git a/ui/app/reducers/metamask.js b/ui/app/reducers/metamask.js
index fb53bbaef..6d6068d05 100644
--- a/ui/app/reducers/metamask.js
+++ b/ui/app/reducers/metamask.js
@@ -37,6 +37,7 @@ function reduceMetamask (state, action) {
     },
     coinOptions: {},
     useBlockie: false,
+    featureFlags: {},
   }, state.metamask)
 
   switch (action.type) {
@@ -320,6 +321,11 @@ function reduceMetamask (state, action) {
             useBlockie: action.value,
           })
 
+    case actions.UPDATE_FEATURE_FLAGS:
+      return extend(metamaskState, {
+        featureFlags: action.value,
+      })
+
     default:
       return metamaskState
 
diff --git a/ui/app/root.js b/ui/app/root.js
index 9e7314b20..21d6d1829 100644
--- a/ui/app/root.js
+++ b/ui/app/root.js
@@ -2,7 +2,7 @@ const inherits = require('util').inherits
 const Component = require('react').Component
 const Provider = require('react-redux').Provider
 const h = require('react-hyperscript')
-const App = require('./app')
+const SelectedApp = require('./select-app')
 
 module.exports = Root
 
@@ -15,7 +15,7 @@ Root.prototype.render = function () {
     h(Provider, {
       store: this.props.store,
     }, [
-      h(App),
+      h(SelectedApp),
     ])
 
   )
diff --git a/ui/app/select-app.js b/ui/app/select-app.js
new file mode 100644
index 000000000..3cba44052
--- /dev/null
+++ b/ui/app/select-app.js
@@ -0,0 +1,21 @@
+const inherits = require('util').inherits
+const Component = require('react').Component
+const connect = require('react-redux').connect
+const h = require('react-hyperscript')
+const App = require('./app')
+const OldApp = require('../../old-ui/app/app')
+
+function mapStateToProps (state) {
+	return { betaUI: state.metamask.featureFlags.betaUI }
+}
+
+module.exports = connect(mapStateToProps)(SelectedApp)
+
+inherits(SelectedApp, Component)
+function SelectedApp () { Component.call(this) }
+
+SelectedApp.prototype.render = function () {
+  const { betaUI } = this.props
+  const Selected = betaUI ? App : OldApp
+  return h(Selected)
+}