diff --git a/docs/latest/extensions/index.md b/docs/latest/extensions/index.md
index 2a03023ae..d5052873f 100644
--- a/docs/latest/extensions/index.md
+++ b/docs/latest/extensions/index.md
@@ -193,7 +193,8 @@ today, create a GitHub issue!
 
 The `ExtensionManager` is a class made available to us via the `@ohif/core`
 project (platform/core). Our application instantiates a single instance of it,
-and provides a `ServicesManager` and `CommandsManager`.
+and provides a `ServicesManager` and `CommandsManager` along with the application's
+configuration through the appConfig key (optional).
 
 ```js
 const commandsManager = new CommandsManager();
@@ -201,6 +202,7 @@ const servicesManager = new ServicesManager();
 const extensionManager = new ExtensionManager({
   commandsManager,
   servicesManager,
+  appConfig
 });
 ```
 
@@ -210,8 +212,8 @@ The `ExtensionManager` only has a few public members:
 - `registerExtensions` - Registers an array of extensions
 - `modules` - An object containing registered extensions by `MODULE_TYPE`
 
-During registration, lifecycle hooks and modules have access to
-`ExtensionManager`'s `ServicesManager` and `CommandsManager`.
+During registration, lifecycle hooks and modules have access to the extension's config,
+the application's config and `ExtensionManager`'s `ServicesManager` and `CommandsManager` instances.
 
 Our `@ohif/viewer` uses the `modules` member to access registered extensions at
 appropriate places in our application.
diff --git a/extensions/_example/src/index.js b/extensions/_example/src/index.js
index 4827f8f94..bafd2ae32 100644
--- a/extensions/_example/src/index.js
+++ b/extensions/_example/src/index.js
@@ -14,6 +14,7 @@ export default {
   preRegistration({
     servicesManager = {},
     commandsManager = {},
+    appConfig = {},
     configuration = {},
   }) {},
 
diff --git a/platform/core/src/extensions/ExtensionManager.js b/platform/core/src/extensions/ExtensionManager.js
index 7b9cba74a..7bb5a30b2 100644
--- a/platform/core/src/extensions/ExtensionManager.js
+++ b/platform/core/src/extensions/ExtensionManager.js
@@ -2,13 +2,14 @@ import MODULE_TYPES from './MODULE_TYPES.js';
 import log from './../log.js';
 
 export default class ExtensionManager {
-  constructor({ commandsManager, servicesManager }) {
+  constructor({ commandsManager, servicesManager, appConfig = {} }) {
     this.modules = {};
     this.registeredExtensionIds = [];
     this.moduleTypeNames = Object.values(MODULE_TYPES);
     //
     this._commandsManager = commandsManager;
     this._servicesManager = servicesManager;
+    this._appConfig = appConfig;
 
     this.moduleTypeNames.forEach(moduleType => {
       this.modules[moduleType] = [];
@@ -70,6 +71,7 @@ export default class ExtensionManager {
       extension.preRegistration({
         servicesManager: this._servicesManager,
         commandsManager: this._commandsManager,
+        appConfig: this._appConfig,
         configuration,
       });
     }
@@ -79,7 +81,8 @@ export default class ExtensionManager {
       const extensionModule = this._getExtensionModule(
         moduleType,
         extension,
-        extensionId
+        extensionId,
+        configuration
       );
 
       if (extensionModule) {
@@ -102,7 +105,7 @@ export default class ExtensionManager {
    * @param {Object} extension
    * @param {string} extensionId - Used for logging warnings
    */
-  _getExtensionModule(moduleType, extension, extensionId) {
+  _getExtensionModule(moduleType, extension, extensionId, configuration) {
     const getModuleFnName = 'get' + _capitalizeFirstCharacter(moduleType);
     const getModuleFn = extension[getModuleFnName];
 
@@ -114,6 +117,8 @@ export default class ExtensionManager {
       const extensionModule = getModuleFn({
         servicesManager: this._servicesManager,
         commandsManager: this._commandsManager,
+        appConfig: this._appConfig,
+        configuration,
       });
 
       if (!extensionModule) {
diff --git a/platform/core/src/extensions/ExtensionManager.test.js b/platform/core/src/extensions/ExtensionManager.test.js
index 1a506b0c0..5ed3fad8d 100644
--- a/platform/core/src/extensions/ExtensionManager.test.js
+++ b/platform/core/src/extensions/ExtensionManager.test.js
@@ -6,7 +6,7 @@ import log from './../log.js';
 jest.mock('./../log.js');
 
 describe('ExtensionManager.js', () => {
-  let extensionManager, commandsManager;
+  let extensionManager, commandsManager, servicesManager, appConfig;
 
   beforeEach(() => {
     commandsManager = {
@@ -14,7 +14,17 @@ describe('ExtensionManager.js', () => {
       getContext: jest.fn(),
       registerCommand: jest.fn(),
     };
-    extensionManager = new ExtensionManager({ commandsManager });
+    servicesManager = {
+      registerService: jest.fn(),
+    };
+    appConfig = {
+      testing: true,
+    };
+    extensionManager = new ExtensionManager({
+      servicesManager,
+      commandsManager,
+      appConfig,
+    });
     log.warn.mockClear();
     jest.clearAllMocks();
   });
@@ -51,7 +61,7 @@ describe('ExtensionManager.js', () => {
       extensionManager.registerExtensions(fakeExtensions);
 
       // Assert
-      expect(extensionManager.registerExtension.mock.calls[1]).toContain(
+      expect(extensionManager.registerExtension.mock.calls[1][1]).toEqual(
         fakeConfiguration
       );
     });
@@ -67,19 +77,19 @@ describe('ExtensionManager.js', () => {
       expect(fakeExtension.preRegistration.mock.calls.length).toBe(1);
     });
 
-    it('calls preRegistration() passing configuration along with servicesManager and commandsManager instances for extension', () => {
-      const configuration = { config: 'Some configuration' };
-      extensionManager._servicesManager = { services: { TestService: {} } };
+    it('calls preRegistration() passing dependencies and extension configuration to extension', () => {
+      const extensionConfiguration = { config: 'Some configuration' };
 
       // SUT
-      const fakeExtension = { one: '1', preRegistration: jest.fn() };
-      extensionManager.registerExtension(fakeExtension, configuration);
+      const extension = { one: '1', preRegistration: jest.fn() };
+      extensionManager.registerExtension(extension, extensionConfiguration);
 
       // Assert
-      expect(fakeExtension.preRegistration.mock.calls[0][0]).toEqual({
-        servicesManager: extensionManager._servicesManager,
-        commandsManager: extensionManager._commandsManager,
-        configuration,
+      expect(extension.preRegistration.mock.calls[0][0]).toEqual({
+        servicesManager,
+        commandsManager,
+        appConfig,
+        configuration: extensionConfiguration,
       });
     });
 
@@ -153,8 +163,8 @@ describe('ExtensionManager.js', () => {
       );
     });
 
-    it('successfully passes a servicesManager and commandsManager instances to each module', () => {
-      extensionManager._servicesManager = { services: { TestService: {} } };
+    it('successfully passes dependencies to each module along with extension configuration', () => {
+      const extensionConfiguration = { testing: true };
 
       const extension = {
         id: 'hello-world',
@@ -165,11 +175,17 @@ describe('ExtensionManager.js', () => {
         getCommandsModule: jest.fn(),
       };
 
-      extensionManager.registerExtension(extension);
+      extensionManager.registerExtension(extension, extensionConfiguration);
 
-      expect(extension.getViewportModule.mock.calls[0][0]).toEqual({
-        servicesManager: extensionManager._servicesManager,
-        commandsManager: extensionManager._commandsManager,
+      Object.keys(extension).forEach(module => {
+        if (typeof extension[module] === 'function') {
+          expect(extension[module].mock.calls[0][0]).toEqual({
+            servicesManager,
+            commandsManager,
+            appConfig,
+            configuration: extensionConfiguration,
+          });
+        }
       });
     });
 
diff --git a/platform/core/src/services/ServicesManager.js b/platform/core/src/services/ServicesManager.js
index c64b74c8f..db5dec800 100644
--- a/platform/core/src/services/ServicesManager.js
+++ b/platform/core/src/services/ServicesManager.js
@@ -33,7 +33,9 @@ export default class ServicesManager {
     }
 
     if (service.create) {
-      this.services[service.name] = service.create({ configuration });
+      this.services[service.name] = service.create({
+        configuration,
+      });
     } else {
       log.warn(`Service create factory function not defined. Exiting early.`);
       return;
diff --git a/platform/core/src/services/ServicesManager.test.js b/platform/core/src/services/ServicesManager.test.js
index c8b5a3f0d..e1c35d120 100644
--- a/platform/core/src/services/ServicesManager.test.js
+++ b/platform/core/src/services/ServicesManager.test.js
@@ -33,7 +33,7 @@ describe('ServicesManager.js', () => {
         [{ name: 'UIModalTestService', create: jest.fn() }, fakeConfiguration],
       ]);
 
-      expect(servicesManager.registerService.mock.calls[1]).toContain(
+      expect(servicesManager.registerService.mock.calls[1][1]).toEqual(
         fakeConfiguration
       );
     });
@@ -85,7 +85,7 @@ describe('ServicesManager.js', () => {
       expect(log.warn.mock.calls.length).toBe(1);
     });
 
-    it('pass configuration to service create factory function', () => {
+    it('pass dependencies and configuration to service create factory function', () => {
       const configuration = { config: 'Some configuration' };
 
       servicesManager.registerService(fakeService, configuration);
diff --git a/platform/viewer/src/App.js b/platform/viewer/src/App.js
index 801e6df21..fc07a8566 100644
--- a/platform/viewer/src/App.js
+++ b/platform/viewer/src/App.js
@@ -64,10 +64,7 @@ const commandsManagerConfig = {
 const commandsManager = new CommandsManager(commandsManagerConfig);
 const hotkeysManager = new HotkeysManager(commandsManager);
 const servicesManager = new ServicesManager();
-const extensionManager = new ExtensionManager({
-  commandsManager,
-  servicesManager,
-});
+let extensionManager;
 /** ~~~~~~~~~~~~~ End Application Setup */
 
 // TODO[react] Use a provider when the whole tree is React
@@ -128,7 +125,8 @@ class App extends Component {
     _initServices([UINotificationService, UIModalService, UIDialogService]);
     _initExtensions(
       [...defaultExtensions, ...extensions],
-      cornerstoneExtensionConfig
+      cornerstoneExtensionConfig,
+      this._appConfig
     );
 
     /*
@@ -241,7 +239,13 @@ function _initServices(services) {
 /**
  * @param
  */
-function _initExtensions(extensions, cornerstoneExtensionConfig) {
+function _initExtensions(extensions, cornerstoneExtensionConfig, appConfig) {
+  extensionManager = new ExtensionManager({
+    commandsManager,
+    servicesManager,
+    appConfig,
+  });
+
   const requiredExtensions = [
     GenericViewerCommands,
     [OHIFCornerstoneExtension, cornerstoneExtensionConfig],