diff --git a/src/vs/platform/userDataSync/common/userDataSync.ts b/src/vs/platform/userDataSync/common/userDataSync.ts
index 8c10789cd1f..72fd5b81609 100644
--- a/src/vs/platform/userDataSync/common/userDataSync.ts
+++ b/src/vs/platform/userDataSync/common/userDataSync.ts
@@ -225,7 +225,6 @@ export interface IUserDataSyncUtilService {
 	updateConfigurationValue(key: string, value: any): Promise<void>;
 	resolveUserBindings(userbindings: string[]): Promise<IStringDictionary<string>>;
 	resolveFormattingOptions(resource: URI): Promise<FormattingOptions>;
-	ignoreExtensionsToSync(extensionIdentifiers: IExtensionIdentifier[]): Promise<void>;
 }
 
 export const IUserDataAuthTokenService = createDecorator<IUserDataAuthTokenService>('IUserDataAuthTokenService');
diff --git a/src/vs/platform/userDataSync/common/userDataSyncIpc.ts b/src/vs/platform/userDataSync/common/userDataSyncIpc.ts
index e00a58bead7..feaec1ba928 100644
--- a/src/vs/platform/userDataSync/common/userDataSyncIpc.ts
+++ b/src/vs/platform/userDataSync/common/userDataSyncIpc.ts
@@ -9,7 +9,6 @@ import { IUserDataSyncService, IUserDataSyncUtilService, ISettingsSyncService, I
 import { URI } from 'vs/base/common/uri';
 import { IStringDictionary } from 'vs/base/common/collections';
 import { FormattingOptions } from 'vs/base/common/jsonFormatter';
-import { IExtensionIdentifier } from 'vs/platform/extensionManagement/common/extensionManagement';
 
 export class UserDataSyncChannel implements IServerChannel {
 
@@ -124,7 +123,6 @@ export class UserDataSycnUtilServiceChannel implements IServerChannel {
 			case 'resolveUserKeybindings': return this.service.resolveUserBindings(args[0]);
 			case 'resolveFormattingOptions': return this.service.resolveFormattingOptions(URI.revive(args[0]));
 			case 'updateConfigurationValue': return this.service.updateConfigurationValue(args[0], args[1]);
-			case 'ignoreExtensionsToSync': return this.service.ignoreExtensionsToSync(args[0]);
 		}
 		throw new Error('Invalid call');
 	}
@@ -149,9 +147,5 @@ export class UserDataSyncUtilServiceClient implements IUserDataSyncUtilService {
 		return this.channel.call('updateConfigurationValue', [key, value]);
 	}
 
-	async ignoreExtensionsToSync(extensionIdentifiers: IExtensionIdentifier[]): Promise<void> {
-		return this.channel.call('ignoreExtensionsToSync', [extensionIdentifiers]);
-	}
-
 }
 
diff --git a/src/vs/workbench/services/userDataSync/common/userDataSyncUtil.ts b/src/vs/workbench/services/userDataSync/common/userDataSyncUtil.ts
index 51cb80ace6a..e4b220be0ab 100644
--- a/src/vs/workbench/services/userDataSync/common/userDataSyncUtil.ts
+++ b/src/vs/workbench/services/userDataSync/common/userDataSyncUtil.ts
@@ -12,13 +12,6 @@ import { URI } from 'vs/base/common/uri';
 import { ITextModelService } from 'vs/editor/common/services/resolverService';
 import { ITextResourcePropertiesService, ITextResourceConfigurationService } from 'vs/editor/common/services/textResourceConfigurationService';
 import { IConfigurationService, ConfigurationTarget } from 'vs/platform/configuration/common/configuration';
-import type { IExtensionIdentifier } from 'vs/platform/extensions/common/extensions';
-import { IQuickInputService } from 'vs/platform/quickinput/common/quickInput';
-import { DisposableStore } from 'vs/base/common/lifecycle';
-import { IExtensionGalleryService } from 'vs/platform/extensionManagement/common/extensionManagement';
-import { CancellationToken } from 'vs/base/common/cancellation';
-import { localize } from 'vs/nls';
-import { areSameExtensions } from 'vs/platform/extensionManagement/common/extensionManagementUtil';
 
 class UserDataSyncUtilService implements IUserDataSyncUtilService {
 
@@ -30,8 +23,6 @@ class UserDataSyncUtilService implements IUserDataSyncUtilService {
 		@ITextResourcePropertiesService private readonly textResourcePropertiesService: ITextResourcePropertiesService,
 		@ITextResourceConfigurationService private readonly textResourceConfigurationService: ITextResourceConfigurationService,
 		@IConfigurationService private readonly configurationService: IConfigurationService,
-		@IQuickInputService private readonly quickInputService: IQuickInputService,
-		@IExtensionGalleryService private readonly extensionGalleryService: IExtensionGalleryService
 	) { }
 
 	public async updateConfigurationValue(key: string, value: any): Promise<void> {
@@ -62,38 +53,6 @@ class UserDataSyncUtilService implements IUserDataSyncUtilService {
 		};
 	}
 
-	async ignoreExtensionsToSync(extensionIdentifiers: IExtensionIdentifier[]): Promise<void> {
-		return new Promise(async (c, e) => {
-			const disposables: DisposableStore = new DisposableStore();
-			const quickPick = this.quickInputService.createQuickPick<{ identifier: IExtensionIdentifier, label: string, description: string }>();
-			disposables.add(quickPick);
-			quickPick.title = localize('select extensions', "Sync: Select Extensions to Sync");
-			quickPick.placeholder = localize('choose extensions to sync', "Choose extensions to sync");
-			quickPick.canSelectMany = true;
-			quickPick.ignoreFocusOut = true;
-			quickPick.busy = true;
-			quickPick.show();
-			const queryResult = await this.extensionGalleryService.query({ names: extensionIdentifiers.map(e => e.id), pageSize: extensionIdentifiers.length }, CancellationToken.None);
-			const items = queryResult.firstPage.map(e => ({
-				identifier: e.identifier,
-				label: e.identifier.id,
-				description: e.displayName
-			}));
-			quickPick.busy = false;
-			quickPick.items = items;
-			quickPick.selectedItems = items;
-			disposables.add(quickPick.onDidAccept(async () => {
-				const ignoredExtensions: string[] = this.configurationService.getValue<string[]>('sync.ignoredExtensions').filter(id => quickPick.selectedItems.every(({ identifier }) => !areSameExtensions(identifier, { id })));
-				ignoredExtensions.push(...items.filter(item => quickPick.selectedItems.indexOf(item) === -1).map(({ identifier }) => identifier.id));
-				await this.configurationService.updateValue('sync.ignoredExtensions', ignoredExtensions);
-				quickPick.hide();
-			}));
-			disposables.add(quickPick.onDidHide(() => {
-				disposables.dispose();
-				c();
-			}));
-		});
-	}
 }
 
 registerSingleton(IUserDataSyncUtilService, UserDataSyncUtilService);