diff --git a/src/vs/platform/extensionManagement/common/extensionEnablementService.ts b/src/vs/platform/extensionManagement/common/extensionEnablementService.ts
index b67a779c2858a39ad0845c84b3de532421440b86..b3e6041730cafcecbf4b9f7762589f7b034a6d78 100644
--- a/src/vs/platform/extensionManagement/common/extensionEnablementService.ts
+++ b/src/vs/platform/extensionManagement/common/extensionEnablementService.ts
@@ -14,8 +14,8 @@ export class GlobalExtensionEnablementService extends Disposable implements IGlo
 
 	_serviceBrand: undefined;
 
-	private _onDidChangeEnablement = new Emitter<readonly IExtensionIdentifier[]>();
-	readonly onDidChangeEnablement: Event<readonly IExtensionIdentifier[]> = this._onDidChangeEnablement.event;
+	private _onDidChangeEnablement = new Emitter<{ readonly extensions: IExtensionIdentifier[], readonly source?: string }>();
+	readonly onDidChangeEnablement: Event<{ readonly extensions: IExtensionIdentifier[], readonly source?: string }> = this._onDidChangeEnablement.event;
 	private readonly storageManger: StorageManager;
 
 	constructor(
@@ -23,20 +23,20 @@ export class GlobalExtensionEnablementService extends Disposable implements IGlo
 	) {
 		super();
 		this.storageManger = this._register(new StorageManager(storageService));
-		this._register(this.storageManger.onDidChange(extensions => this._onDidChangeEnablement.fire(extensions)));
+		this._register(this.storageManger.onDidChange(extensions => this._onDidChangeEnablement.fire({ extensions, source: 'storage' })));
 	}
 
-	async enableExtension(extension: IExtensionIdentifier): Promise<boolean> {
+	async enableExtension(extension: IExtensionIdentifier, source?: string): Promise<boolean> {
 		if (this._removeFromDisabledExtensions(extension)) {
-			this._onDidChangeEnablement.fire([extension]);
+			this._onDidChangeEnablement.fire({ extensions: [extension], source });
 			return true;
 		}
 		return false;
 	}
 
-	async disableExtension(extension: IExtensionIdentifier): Promise<boolean> {
+	async disableExtension(extension: IExtensionIdentifier, source?: string): Promise<boolean> {
 		if (this._addToDisabledExtensions(extension)) {
-			this._onDidChangeEnablement.fire([extension]);
+			this._onDidChangeEnablement.fire({ extensions: [extension], source });
 			return true;
 		}
 		return false;
diff --git a/src/vs/platform/extensionManagement/common/extensionManagement.ts b/src/vs/platform/extensionManagement/common/extensionManagement.ts
index 1c73c5ad34603e2d60df5e7dd127cc4adf743135..9612407ed0747cf3d5dd4d026bdd16d26fddeeb0 100644
--- a/src/vs/platform/extensionManagement/common/extensionManagement.ts
+++ b/src/vs/platform/extensionManagement/common/extensionManagement.ts
@@ -213,11 +213,11 @@ export const IGlobalExtensionEnablementService = createDecorator<IGlobalExtensio
 
 export interface IGlobalExtensionEnablementService {
 	_serviceBrand: undefined;
-	readonly onDidChangeEnablement: Event<readonly IExtensionIdentifier[]>;
+	readonly onDidChangeEnablement: Event<{ readonly extensions: IExtensionIdentifier[], readonly source?: string }>;
 
 	getDisabledExtensions(): IExtensionIdentifier[];
-	enableExtension(extension: IExtensionIdentifier): Promise<boolean>;
-	disableExtension(extension: IExtensionIdentifier): Promise<boolean>;
+	enableExtension(extension: IExtensionIdentifier, source?: string): Promise<boolean>;
+	disableExtension(extension: IExtensionIdentifier, source?: string): Promise<boolean>;
 
 	// Async method until storage service is available in shared process
 	getDisabledExtensionsAsync(): Promise<IExtensionIdentifier[]>;
diff --git a/src/vs/platform/extensionManagement/common/extensionManagementIpc.ts b/src/vs/platform/extensionManagement/common/extensionManagementIpc.ts
index b5f8114efe0be7d087fcdfa27d0098aff8506509..41544466ab59ec3273c9f2cab7be82669509ec76 100644
--- a/src/vs/platform/extensionManagement/common/extensionManagementIpc.ts
+++ b/src/vs/platform/extensionManagement/common/extensionManagementIpc.ts
@@ -156,7 +156,7 @@ export class GlobalExtensionEnablementServiceClient implements IGlobalExtensionE
 
 	_serviceBrand: undefined;
 
-	get onDidChangeEnablement(): Event<IExtensionIdentifier[]> { return this.channel.listen('onDidChangeEnablement'); }
+	get onDidChangeEnablement(): Event<{ readonly extensions: IExtensionIdentifier[], readonly source?: string }> { return this.channel.listen('onDidChangeEnablement'); }
 
 	constructor(private readonly channel: IChannel) {
 	}
diff --git a/src/vs/workbench/contrib/extensions/test/electron-browser/extensionsWorkbenchService.test.ts b/src/vs/workbench/contrib/extensions/test/electron-browser/extensionsWorkbenchService.test.ts
index 82170eaa199368be854e910ec2d55b2739d5fefa..57095928076ed1e0ac740fc2cfbca859bd16b0df 100644
--- a/src/vs/workbench/contrib/extensions/test/electron-browser/extensionsWorkbenchService.test.ts
+++ b/src/vs/workbench/contrib/extensions/test/electron-browser/extensionsWorkbenchService.test.ts
@@ -942,16 +942,6 @@ suite('ExtensionsWorkbenchServiceTest', () => {
 			});
 	});
 
-	test('test installing an extension re-eanbles it when disabled globally', async () => {
-		testObject = await aWorkbenchService();
-		const local = aLocalExtension('pub.a');
-		await instantiationService.get(IWorkbenchExtensionEnablementService).setEnablement([local], EnablementState.DisabledGlobally);
-		didInstallEvent.fire({ local, identifier: local.identifier, operation: InstallOperation.Install });
-		instantiationService.stubPromise(IExtensionManagementService, 'getInstalled', [local]);
-		const actual = await testObject.queryLocal();
-		assert.equal(actual[0].enablementState, EnablementState.EnabledGlobally);
-	});
-
 	test('test updating an extension does not re-eanbles it when disabled globally', async () => {
 		testObject = await aWorkbenchService();
 		const local = aLocalExtension('pub.a');
@@ -962,16 +952,6 @@ suite('ExtensionsWorkbenchServiceTest', () => {
 		assert.equal(actual[0].enablementState, EnablementState.DisabledGlobally);
 	});
 
-	test('test installing an extension re-eanbles it when workspace disabled', async () => {
-		testObject = await aWorkbenchService();
-		const local = aLocalExtension('pub.a');
-		await instantiationService.get(IWorkbenchExtensionEnablementService).setEnablement([local], EnablementState.DisabledWorkspace);
-		didInstallEvent.fire({ local, identifier: local.identifier, operation: InstallOperation.Install });
-		instantiationService.stubPromise(IExtensionManagementService, 'getInstalled', [local]);
-		const actual = await testObject.queryLocal();
-		assert.equal(actual[0].enablementState, EnablementState.EnabledGlobally);
-	});
-
 	test('test updating an extension does not re-eanbles it when workspace disabled', async () => {
 		testObject = await aWorkbenchService();
 		const local = aLocalExtension('pub.a');
diff --git a/src/vs/workbench/services/extensionManagement/common/extensionEnablementService.ts b/src/vs/workbench/services/extensionManagement/common/extensionEnablementService.ts
index ceeee11b03300095c20b0cf1aaa87d74d950032e..d64573ec6dcb923afb10b88608da0de5912a647d 100644
--- a/src/vs/workbench/services/extensionManagement/common/extensionEnablementService.ts
+++ b/src/vs/workbench/services/extensionManagement/common/extensionEnablementService.ts
@@ -19,6 +19,8 @@ import { registerSingleton } from 'vs/platform/instantiation/common/extensions';
 import { IProductService } from 'vs/platform/product/common/productService';
 import { StorageManager } from 'vs/platform/extensionManagement/common/extensionEnablementService';
 
+const SOURCE = 'IWorkbenchExtensionEnablementService';
+
 export class ExtensionEnablementService extends Disposable implements IWorkbenchExtensionEnablementService {
 
 	_serviceBrand: undefined;
@@ -40,7 +42,7 @@ export class ExtensionEnablementService extends Disposable implements IWorkbench
 	) {
 		super();
 		this.storageManger = this._register(new StorageManager(storageService));
-		this._register(this.globalExtensionEnablementService.onDidChangeEnablement(extensions => this.onDidChangeExtensions(extensions)));
+		this._register(this.globalExtensionEnablementService.onDidChangeEnablement(({ extensions, source }) => this.onDidChangeExtensions(extensions, source)));
 		this._register(extensionManagementService.onDidUninstallExtension(this._onDidUninstallExtension, this));
 	}
 
@@ -169,13 +171,13 @@ export class ExtensionEnablementService extends Disposable implements IWorkbench
 	private _enableExtension(identifier: IExtensionIdentifier): Promise<boolean> {
 		this._removeFromWorkspaceDisabledExtensions(identifier);
 		this._removeFromWorkspaceEnabledExtensions(identifier);
-		return this.globalExtensionEnablementService.enableExtension(identifier);
+		return this.globalExtensionEnablementService.enableExtension(identifier, SOURCE);
 	}
 
 	private _disableExtension(identifier: IExtensionIdentifier): Promise<boolean> {
 		this._removeFromWorkspaceDisabledExtensions(identifier);
 		this._removeFromWorkspaceEnabledExtensions(identifier);
-		return this.globalExtensionEnablementService.disableExtension(identifier);
+		return this.globalExtensionEnablementService.disableExtension(identifier, SOURCE);
 	}
 
 	private _enableExtensionInWorkspace(identifier: IExtensionIdentifier): void {
@@ -273,10 +275,12 @@ export class ExtensionEnablementService extends Disposable implements IWorkbench
 		this.storageManger.set(storageId, extensions, StorageScope.WORKSPACE);
 	}
 
-	private async onDidChangeExtensions(extensionIdentifiers: ReadonlyArray<IExtensionIdentifier>): Promise<void> {
-		const installedExtensions = await this.extensionManagementService.getInstalled();
-		const extensions = installedExtensions.filter(installedExtension => extensionIdentifiers.some(identifier => areSameExtensions(identifier, installedExtension.identifier)));
-		this._onEnablementChanged.fire(extensions);
+	private async onDidChangeExtensions(extensionIdentifiers: ReadonlyArray<IExtensionIdentifier>, source?: string): Promise<void> {
+		if (source !== SOURCE) {
+			const installedExtensions = await this.extensionManagementService.getInstalled();
+			const extensions = installedExtensions.filter(installedExtension => extensionIdentifiers.some(identifier => areSameExtensions(identifier, installedExtension.identifier)));
+			this._onEnablementChanged.fire(extensions);
+		}
 	}
 
 	private _onDidUninstallExtension({ identifier, error }: DidUninstallExtensionEvent): void {