diff --git a/extension/src/app/api/index.ts b/extension/src/app/api/index.ts
index db266e6a..a3a7d8ed 100644
--- a/extension/src/app/api/index.ts
+++ b/extension/src/app/api/index.ts
@@ -8,6 +8,7 @@ import generateId from './generateInstanceId';
 import { Config } from '../../browser/extension/inject/pageScript';
 import { Action } from 'redux';
 import { LiftedState, PerformAction } from '@redux-devtools/instrument';
+import { LibConfig } from '@redux-devtools/app/lib/actions';
 
 const listeners = {};
 export const source = '@devtools-page';
@@ -125,7 +126,7 @@ interface InitMessage<S, A extends Action<unknown>> {
   action?: string;
   name?: string | undefined;
   liftedState?: LiftedState<S, A, unknown>;
-  libConfig?: unknown;
+  libConfig?: LibConfig;
 }
 
 interface SerializedPartialLiftedState<S, A extends Action<unknown>> {
@@ -171,17 +172,15 @@ interface SerializedStateMessage<S, A extends Action<unknown>> {
   >;
   readonly source: typeof source;
   readonly instanceId: number;
-  readonly libConfig?: unknown;
+  readonly libConfig?: LibConfig;
   readonly actionsById: string;
   readonly computedStates: string;
   readonly committedState: boolean;
 }
-
-export type PageScriptToContentScriptMessageWithoutDisconnect<
+export type PageScriptToContentScriptMessageWithoutDisconnectOrInitInstance<
   S,
   A extends Action<unknown>
 > =
-  | InitInstancePageScriptToContentScriptMessage
   | InitMessage<S, A>
   | LiftedMessage
   | SerializedPartialStateMessage<S, A>
@@ -193,6 +192,13 @@ export type PageScriptToContentScriptMessageWithoutDisconnect<
   | GetReportMessage
   | StopMessage;
 
+export type PageScriptToContentScriptMessageWithoutDisconnect<
+  S,
+  A extends Action<unknown>
+> =
+  | PageScriptToContentScriptMessageWithoutDisconnectOrInitInstance<S, A>
+  | InitInstancePageScriptToContentScriptMessage;
+
 export type PageScriptToContentScriptMessage<S, A extends Action<unknown>> =
   | PageScriptToContentScriptMessageWithoutDisconnect<S, A>
   | DisconnectMessage;
@@ -258,7 +264,7 @@ function amendActionType(
 
 export interface LiftedMessage {
   readonly type: 'LIFTED';
-  readonly liftedState: { readonly isPaused: boolean };
+  readonly liftedState: { readonly isPaused: boolean | undefined };
   readonly instanceId: number;
   readonly source: typeof source;
 }
@@ -294,7 +300,7 @@ interface StateMessage<S, A extends Action<unknown>> {
   readonly payload: LiftedState<S, A, unknown>;
   readonly source: typeof source;
   readonly instanceId: number;
-  readonly libConfig?: unknown;
+  readonly libConfig?: LibConfig;
 }
 
 interface ErrorMessage {
@@ -447,7 +453,7 @@ export function disconnect() {
   post({ type: 'DISCONNECT', source });
 }
 
-export function connect(preConfig) {
+export function connect(preConfig: Config) {
   const config = preConfig || {};
   const id = generateId(config.instanceId);
   if (!config.instanceId) config.instanceId = id;
diff --git a/extension/src/app/middlewares/api.ts b/extension/src/app/middlewares/api.ts
index 306d1789..8a88f18f 100644
--- a/extension/src/app/middlewares/api.ts
+++ b/extension/src/app/middlewares/api.ts
@@ -6,20 +6,65 @@ import {
 } from '@redux-devtools/app/lib/constants/actionTypes';
 import { nonReduxDispatch } from '@redux-devtools/app/lib/utils/monitorActions';
 import syncOptions, {
+  Options,
   OptionsMessage,
   SyncOptions,
 } from '../../browser/extension/options/syncOptions';
 import openDevToolsWindow from '../../browser/extension/background/openWindow';
 import { getReport } from '../../browser/extension/background/logging';
-import { StoreAction } from '@redux-devtools/app/lib/actions';
-import { Dispatch } from 'redux';
+import {
+  CustomAction,
+  DispatchAction as AppDispatchAction,
+  LiftedActionAction,
+  StoreAction,
+} from '@redux-devtools/app/lib/actions';
+import { Action, Dispatch } from 'redux';
+import { ContentScriptToBackgroundMessage } from '../../browser/extension/inject/contentScript';
 
-interface StartAction {
-  readonly type: 'START';
+interface TabMessageBase {
+  readonly type: string;
+  readonly state?: string | undefined;
+  readonly id?: string;
 }
 
-interface StopAction {
+interface StartAction extends TabMessageBase {
+  readonly type: 'START';
+  readonly state: never;
+  readonly id: never;
+}
+
+interface StopAction extends TabMessageBase {
   readonly type: 'STOP';
+  readonly state: never;
+  readonly id: never;
+}
+
+interface DispatchAction extends TabMessageBase {
+  readonly type: 'DISPATCH';
+  readonly action: AppDispatchAction;
+  readonly state: string | undefined;
+  readonly id: string;
+}
+
+interface ImportAction extends TabMessageBase {
+  readonly type: 'IMPORT';
+  readonly action: undefined;
+  readonly state: string | undefined;
+  readonly id: string;
+}
+
+interface ActionAction extends TabMessageBase {
+  readonly type: 'ACTION';
+  readonly action: string | CustomAction;
+  readonly state: string | undefined;
+  readonly id: string;
+}
+
+interface ExportAction extends TabMessageBase {
+  readonly type: 'EXPORT';
+  readonly action: undefined;
+  readonly state: string | undefined;
+  readonly id: string;
 }
 
 interface NAAction {
@@ -31,7 +76,14 @@ interface UpdateStateAction {
   readonly type: typeof UPDATE_STATE;
 }
 
-export type TabMessage = StartAction | StopAction | OptionsMessage;
+export type TabMessage =
+  | StartAction
+  | StopAction
+  | OptionsMessage
+  | DispatchAction
+  | ImportAction
+  | ActionAction
+  | ExportAction;
 type PanelMessage = NAAction;
 type MonitorMessage = UpdateStateAction;
 
@@ -87,7 +139,7 @@ interface ImportMessage {
   readonly state: string;
 }
 
-type ToContentScriptMessage = ImportMessage;
+type ToContentScriptMessage = ImportMessage | LiftedActionAction;
 
 function toContentScript({
   message,
@@ -144,13 +196,13 @@ function togglePersist() {
 }
 
 type BackgroundStoreMessage = unknown;
-type BackgroundStoreResponse = never;
+type BackgroundStoreResponse = { readonly options: Options };
 
 // Receive messages from content scripts
 function messaging(
   request: BackgroundStoreMessage,
   sender: chrome.runtime.MessageSender,
-  sendResponse: (response?: BackgroundStoreResponse) => void
+  sendResponse?: (response?: BackgroundStoreResponse) => void
 ) {
   let tabId = getId(sender);
   if (!tabId) return;
@@ -168,7 +220,7 @@ function messaging(
   }
   if (request.type === 'GET_OPTIONS') {
     window.syncOptions.get((options) => {
-      sendResponse({ options });
+      sendResponse!({ options });
     });
     return;
   }
@@ -256,7 +308,7 @@ function disconnect(
   };
 }
 
-function onConnect(port: chrome.runtime.Port) {
+function onConnect<S, A extends Action<unknown>>(port: chrome.runtime.Port) {
   let id: number | string;
   let listener;
 
@@ -266,7 +318,7 @@ function onConnect(port: chrome.runtime.Port) {
     id = getId(port.sender!);
     if (port.sender!.frameId) id = `${id}-${port.sender!.frameId}`;
     connections.tab[id] = port;
-    listener = (msg) => {
+    listener = (msg: ContentScriptToBackgroundMessage<S, A>) => {
       if (msg.name === 'INIT_INSTANCE') {
         if (typeof id === 'number') {
           chrome.pageAction.show(id);
@@ -292,7 +344,7 @@ function onConnect(port: chrome.runtime.Port) {
         return;
       }
       if (msg.name === 'RELAY') {
-        messaging(msg.message, port.sender!, id);
+        messaging(msg.message, port.sender!);
       }
     };
     port.onMessage.addListener(listener);
diff --git a/extension/src/app/service/Monitor.ts b/extension/src/app/service/Monitor.ts
index 210e288d..36166e21 100644
--- a/extension/src/app/service/Monitor.ts
+++ b/extension/src/app/service/Monitor.ts
@@ -1,6 +1,6 @@
 import { Action } from 'redux';
 import { LiftedState } from '@redux-devtools/instrument';
-import { StoreAction } from '@redux-devtools/app/lib/actions';
+import { LibConfig, StoreAction } from '@redux-devtools/app/lib/actions';
 
 declare global {
   interface Window {
@@ -11,7 +11,7 @@ declare global {
 export default class Monitor<S, A extends Action<unknown>> {
   update: (
     liftedState?: LiftedState<S, A, unknown> | undefined,
-    libConfig?: unknown
+    libConfig?: LibConfig
   ) => void;
   active?: boolean;
   paused?: boolean;
@@ -19,7 +19,7 @@ export default class Monitor<S, A extends Action<unknown>> {
   constructor(
     update: (
       liftedState?: LiftedState<S, A, unknown> | undefined,
-      libConfig?: unknown
+      libConfig?: LibConfig
     ) => void
   ) {
     this.update = update;
diff --git a/extension/src/browser/extension/inject/contentScript.ts b/extension/src/browser/extension/inject/contentScript.ts
index 2611ff2c..671a7ae9 100644
--- a/extension/src/browser/extension/inject/contentScript.ts
+++ b/extension/src/browser/extension/inject/contentScript.ts
@@ -7,8 +7,13 @@ import { TabMessage } from '../../../app/middlewares/api';
 import {
   PageScriptToContentScriptMessage,
   PageScriptToContentScriptMessageWithoutDisconnect,
+  PageScriptToContentScriptMessageWithoutDisconnectOrInitInstance,
 } from '../../../app/api';
 import { Action } from 'redux';
+import {
+  CustomAction,
+  DispatchAction as AppDispatchAction,
+} from '@redux-devtools/app/lib/actions';
 const source = '@devtools-extension';
 const pageSource = '@devtools-page';
 // Chrome message limit is 64 MB, but we're using 32 MB to include other object's parts
@@ -22,6 +27,73 @@ declare global {
   }
 }
 
+interface StartAction {
+  readonly type: 'START';
+  readonly state: undefined;
+  readonly id: undefined;
+  readonly source: typeof source;
+}
+
+interface StopAction {
+  readonly type: 'STOP';
+  readonly state: undefined;
+  readonly id: undefined;
+  readonly source: typeof source;
+  readonly failed?: boolean;
+}
+
+interface DispatchAction {
+  readonly type: 'DISPATCH';
+  readonly payload: AppDispatchAction;
+  readonly state: string | undefined;
+  readonly id: string;
+  readonly source: typeof source;
+}
+
+interface ImportAction {
+  readonly type: 'IMPORT';
+  readonly payload: undefined;
+  readonly state: string | undefined;
+  readonly id: string;
+  readonly source: typeof source;
+}
+
+interface ActionAction {
+  readonly type: 'ACTION';
+  readonly payload: string | CustomAction;
+  readonly state: string | undefined;
+  readonly id: string;
+  readonly source: typeof source;
+}
+
+interface ExportAction {
+  readonly type: 'EXPORT';
+  readonly payload: undefined;
+  readonly state: string | undefined;
+  readonly id: string;
+  readonly source: typeof source;
+}
+
+interface UpdateAction {
+  readonly type: 'UPDATE';
+  readonly state: string | undefined;
+  readonly id: string;
+  readonly source: typeof source;
+}
+
+export type ContentScriptToPageScriptMessage =
+  | StartAction
+  | StopAction
+  | DispatchAction
+  | ImportAction
+  | ActionAction
+  | ExportAction
+  | UpdateAction;
+
+function postToPageScript(message: ContentScriptToPageScriptMessage) {
+  window.postMessage(message, '*');
+}
+
 function connect() {
   // Connect to the background script
   connected = true;
@@ -35,28 +107,40 @@ function connect() {
   // Relay background script messages to the page script
   bg.onMessage.addListener((message: TabMessage) => {
     if ('action' in message) {
-      window.postMessage(
-        {
+      if (message.type === 'DISPATCH') {
+        postToPageScript({
           type: message.type,
           payload: message.action,
           state: message.state,
           id: message.id,
           source,
-        },
-        '*'
-      );
-    } else if ('options' in message) {
-      injectOptions(message.options);
-    } else {
-      window.postMessage(
-        {
+        });
+      } else if (message.type === 'ACTION') {
+        postToPageScript({
           type: message.type,
+          payload: message.action,
           state: message.state,
           id: message.id,
           source,
-        },
-        '*'
-      );
+        });
+      } else {
+        postToPageScript({
+          type: message.type,
+          payload: message.action,
+          state: message.state,
+          id: message.id,
+          source,
+        });
+      }
+    } else if ('options' in message) {
+      injectOptions(message.options);
+    } else {
+      postToPageScript({
+        type: message.type,
+        state: message.state,
+        id: message.id,
+        source,
+      });
     }
   });
 
@@ -93,7 +177,9 @@ interface SplitMessageEnd extends SplitMessageBase {
 type SplitMessage = SplitMessageStart | SplitMessageChunk | SplitMessageEnd;
 
 function tryCatch<S, A extends Action<unknown>>(
-  fn: (args: PageScriptToContentScriptMessage<S, A> | SplitMessage) => void,
+  fn: (
+    args: PageScriptToContentScriptMessageWithoutDisconnect<S, A> | SplitMessage
+  ) => void,
   args: PageScriptToContentScriptMessageWithoutDisconnect<S, A>
 ) {
   try {
@@ -145,21 +231,27 @@ interface InitInstanceContentScriptToBackgroundMessage {
   readonly instanceId: number;
 }
 
-interface RelayMessage {
+interface RelayMessage<S, A extends Action<unknown>> {
   readonly name: 'RELAY';
-  readonly message: unknown;
+  readonly message:
+    | PageScriptToContentScriptMessageWithoutDisconnectOrInitInstance<S, A>
+    | SplitMessage;
 }
 
-export type ContentScriptToBackgroundMessage =
+export type ContentScriptToBackgroundMessage<S, A extends Action<unknown>> =
   | InitInstanceContentScriptToBackgroundMessage
-  | RelayMessage;
+  | RelayMessage<S, A>;
 
-function postToBackground(message: ContentScriptToBackgroundMessage) {
+function postToBackground<S, A extends Action<unknown>>(
+  message: ContentScriptToBackgroundMessage<S, A>
+) {
   bg!.postMessage(message);
 }
 
 function send<S, A extends Action<unknown>>(
-  message: PageScriptToContentScriptMessage<S, A> | SplitMessage
+  message:
+    | PageScriptToContentScriptMessageWithoutDisconnect<S, A>
+    | SplitMessage
 ) {
   if (!connected) connect();
   if (message.type === 'INIT_INSTANCE') {
diff --git a/extension/src/browser/extension/inject/pageScript.ts b/extension/src/browser/extension/inject/pageScript.ts
index b5f8b223..3fbf7c5c 100644
--- a/extension/src/browser/extension/inject/pageScript.ts
+++ b/extension/src/browser/extension/inject/pageScript.ts
@@ -41,6 +41,13 @@ import {
   LiftedState,
   PerformAction,
 } from '@redux-devtools/instrument';
+import {
+  CustomAction,
+  DispatchAction,
+  LibConfig,
+} from '@redux-devtools/app/lib/actions';
+import { ContentScriptToPageScriptMessage } from './contentScript';
+import { Features } from '@redux-devtools/app/lib/reducers/instances';
 
 const source = '@devtools-page';
 let stores: {
@@ -62,10 +69,10 @@ interface SerializeWithImmutable extends Serialize {
 }
 
 export interface ConfigWithExpandedMaxAge {
-  readonly instanceId?: number;
+  instanceId?: number;
   readonly actionsBlacklist?: string | readonly string[];
   readonly actionsWhitelist?: string | readonly string[];
-  readonly serialize?: boolean | SerializeWithImmutable;
+  serialize?: boolean | SerializeWithImmutable;
   readonly serializeState?:
     | boolean
     | ((key: string, value: unknown) => unknown)
@@ -107,7 +114,9 @@ export interface ConfigWithExpandedMaxAge {
   readonly pauseActionType?: unknown;
   readonly deserializeState?: <S>(state: S) => S;
   readonly deserializeAction?: <A extends Action<unknown>>(action: A) => A;
-  readonly name?: string;
+  name?: string;
+  readonly autoPause?: boolean;
+  readonly features?: Features;
 }
 
 export interface Config extends ConfigWithExpandedMaxAge {
@@ -182,7 +191,7 @@ function __REDUX_DEVTOOLS_EXTENSION__<S, A extends Action<unknown>>(
   const relayState = throttle(
     (
       liftedState?: LiftedState<S, A, unknown> | undefined,
-      libConfig?: unknown
+      libConfig?: LibConfig
     ) => {
       relayAction.cancel();
       const state = liftedState || store.liftedStore.getState();
@@ -328,8 +337,8 @@ function __REDUX_DEVTOOLS_EXTENSION__<S, A extends Action<unknown>>(
     );
   }, latency);
 
-  function dispatchRemotely(action) {
-    if (config.features && !config.features.dispatch) return;
+  function dispatchRemotely(action: string | CustomAction) {
+    if (config!.features && !config!.features.dispatch) return;
     try {
       const result = evalAction(action, actionCreators);
       (store.initialDispatch || store.dispatch)(result);
@@ -367,7 +376,7 @@ function __REDUX_DEVTOOLS_EXTENSION__<S, A extends Action<unknown>>(
     }
   }
 
-  function dispatchMonitorAction(action) {
+  function dispatchMonitorAction(action: DispatchAction) {
     const type = action.type;
     const features = config.features;
     if (features) {
@@ -393,7 +402,7 @@ function __REDUX_DEVTOOLS_EXTENSION__<S, A extends Action<unknown>>(
     store.liftedStore.dispatch(action);
   }
 
-  function onMessage(message) {
+  function onMessage(message: ContentScriptToPageScriptMessage) {
     switch (message.type) {
       case 'DISPATCH':
         dispatchMonitorAction(message.payload);
@@ -416,10 +425,10 @@ function __REDUX_DEVTOOLS_EXTENSION__<S, A extends Action<unknown>>(
           actionCreators = getActionsArray(config.actionCreators);
         }
         relayState(undefined, {
-          name: config.name || document.title,
+          name: config!.name || document.title,
           actionCreators: JSON.stringify(actionCreators),
-          features: config.features,
-          serialize: !!config.serialize,
+          features: config!.features,
+          serialize: !!config!.serialize,
           type: 'redux',
         });
 
diff --git a/packages/redux-devtools-app/src/actions/index.ts b/packages/redux-devtools-app/src/actions/index.ts
index 3eda8bb8..a6e5ae43 100644
--- a/packages/redux-devtools-app/src/actions/index.ts
+++ b/packages/redux-devtools-app/src/actions/index.ts
@@ -268,7 +268,7 @@ export function pauseRecording(status: boolean): LiftedActionDispatchAction {
 export interface CustomAction {
   name: string;
   selected: number;
-  args: (string | undefined)[];
+  args: string[];
   rest: string;
 }
 export function dispatchRemotely(
@@ -354,7 +354,7 @@ export interface ActionCreator {
   name: string;
 }
 
-interface LibConfig {
+export interface LibConfig {
   actionCreators?: string;
   name?: string;
   type?: string;
diff --git a/packages/redux-devtools-app/src/containers/monitors/Dispatcher.tsx b/packages/redux-devtools-app/src/containers/monitors/Dispatcher.tsx
index 63ed71e5..4a6a1746 100644
--- a/packages/redux-devtools-app/src/containers/monitors/Dispatcher.tsx
+++ b/packages/redux-devtools-app/src/containers/monitors/Dispatcher.tsx
@@ -55,7 +55,7 @@ type Props = DispatchProps & OwnProps;
 interface State {
   selected: 'default' | number;
   customAction: string;
-  args: (string | undefined)[];
+  args: string[];
   rest: string;
   changed: boolean;
 }
@@ -108,7 +108,7 @@ class Dispatcher extends Component<Props, State> {
   handleArg = (argIndex: number) => (value: string) => {
     const args = [
       ...this.state.args.slice(0, argIndex),
-      value || undefined,
+      (value || undefined)!,
       ...this.state.args.slice(argIndex + 1),
     ];
     this.setState({ args, changed: true });
diff --git a/packages/redux-devtools-app/src/utils/monitorActions.ts b/packages/redux-devtools-app/src/utils/monitorActions.ts
index 1e5fc604..0889bfcc 100644
--- a/packages/redux-devtools-app/src/utils/monitorActions.ts
+++ b/packages/redux-devtools-app/src/utils/monitorActions.ts
@@ -26,7 +26,7 @@ export function nonReduxDispatch(
   instanceId: string,
   action: DispatchAction,
   initialState: string | undefined,
-  preInstances: InstancesState
+  preInstances?: InstancesState
 ) {
   const instances = preInstances || store.getState().instances;
   const state = instances.states[instanceId];