diff --git a/build/lib/i18n.resources.json b/build/lib/i18n.resources.json
index fe52738840e..43ded2f2b07 100644
--- a/build/lib/i18n.resources.json
+++ b/build/lib/i18n.resources.json
@@ -397,6 +397,10 @@
 		{
 			"name": "vs/workbench/services/gettingStarted",
 			"project": "vscode-workbench"
+		},
+		{
+			"name": "vs/workbench/services/host",
+			"project": "vscode-workbench"
 		}
 	]
 }
diff --git a/src/vs/base/browser/dom.ts b/src/vs/base/browser/dom.ts
index 58ebdb5b2c0..022fe7c0c19 100644
--- a/src/vs/base/browser/dom.ts
+++ b/src/vs/base/browser/dom.ts
@@ -1193,18 +1193,21 @@ export function computeScreenAwareSize(cssPx: number): number {
  * to change the location of the current page.
  * See https://mathiasbynens.github.io/rel-noopener/
  */
-export function windowOpenNoOpener(url: string): void {
+export function windowOpenNoOpener(url: string): boolean {
 	if (browser.isElectron || browser.isEdgeLegacyWebView) {
 		// In VSCode, window.open() always returns null...
 		// The same is true for a WebView (see https://github.com/microsoft/monaco-editor/issues/628)
 		// Also call directly window.open in sandboxed Electron (see https://github.com/microsoft/monaco-editor/issues/2220)
 		window.open(url);
+		return true;
 	} else {
 		let newTab = window.open();
 		if (newTab) {
 			(newTab as any).opener = null;
 			newTab.location.href = url;
+			return true;
 		}
+		return false;
 	}
 }
 
diff --git a/src/vs/workbench/browser/window.ts b/src/vs/workbench/browser/window.ts
index 56782daaea3..d52927fd571 100644
--- a/src/vs/workbench/browser/window.ts
+++ b/src/vs/workbench/browser/window.ts
@@ -138,7 +138,13 @@ export class BrowserWindow extends Disposable {
 		this.openerService.setDefaultExternalOpener({
 			openExternal: async (href: string) => {
 				if (matchesScheme(href, Schemas.http) || matchesScheme(href, Schemas.https)) {
-					windowOpenNoOpener(href);
+					const opened = windowOpenNoOpener(href);
+					if (!opened) {
+						const showResult = await this.dialogService.show(Severity.Warning, localize('unableToOpenExternal', "The browser prevented opening of a new tab or window. You must give permission to continue."), [localize('continue', "Continue"), localize('cancel', "Cancel")], { cancelId: 1 });
+						if (showResult.choice === 0) {
+							windowOpenNoOpener(href);
+						}
+					}
 				} else {
 					this.lifecycleService.withExpectedUnload(() => window.location.href = href);
 				}
diff --git a/src/vs/workbench/contrib/debug/browser/rawDebugSession.ts b/src/vs/workbench/contrib/debug/browser/rawDebugSession.ts
index 08fc6c9a192..f9c3477a8a5 100644
--- a/src/vs/workbench/contrib/debug/browser/rawDebugSession.ts
+++ b/src/vs/workbench/contrib/debug/browser/rawDebugSession.ts
@@ -570,7 +570,8 @@ export class RawDebugSession implements IDisposable {
 				try {
 					let result = await this.launchVsCode(<ILaunchVSCodeArguments>request.arguments);
 					if (!result.success) {
-						const showResult = await this.dialogSerivce.show(Severity.Warning, nls.localize('canNotStart', "The debugger needs to open a new tab or window for the debuggee but the browser prevented this. You must give permission to continue."), [nls.localize('continue', "Continue"), nls.localize('cancel', "Cancel")]);
+						const showResult = await this.dialogSerivce.show(Severity.Warning, nls.localize('canNotStart', "The debugger needs to open a new tab or window for the debuggee but the browser prevented this. You must give permission to continue."),
+							[nls.localize('continue', "Continue"), nls.localize('cancel', "Cancel")], { cancelId: 1 });
 						if (showResult.choice === 0) {
 							result = await this.launchVsCode(<ILaunchVSCodeArguments>request.arguments);
 						} else {
diff --git a/src/vs/workbench/services/host/browser/browserHostService.ts b/src/vs/workbench/services/host/browser/browserHostService.ts
index b00b6f0f813..8a783b1d760 100644
--- a/src/vs/workbench/services/host/browser/browserHostService.ts
+++ b/src/vs/workbench/services/host/browser/browserHostService.ts
@@ -27,6 +27,9 @@ import { IInstantiationService } from 'vs/platform/instantiation/common/instanti
 import { BeforeShutdownEvent, ILifecycleService } from 'vs/workbench/services/lifecycle/common/lifecycle';
 import { ILogService } from 'vs/platform/log/common/log';
 import { getWorkspaceIdentifier } from 'vs/workbench/services/workspaces/browser/workspaces';
+import { localize } from 'vs/nls';
+import Severity from 'vs/base/common/severity';
+import { IDialogService } from 'vs/platform/dialogs/common/dialogs';
 
 /**
  * A workspace to open in the workbench can either be:
@@ -102,7 +105,8 @@ export class BrowserHostService extends Disposable implements IHostService {
 		@IWorkbenchEnvironmentService private readonly environmentService: IWorkbenchEnvironmentService,
 		@IInstantiationService private readonly instantiationService: IInstantiationService,
 		@ILifecycleService private readonly lifecycleService: ILifecycleService,
-		@ILogService private readonly logService: ILogService
+		@ILogService private readonly logService: ILogService,
+		@IDialogService private readonly dialogService: IDialogService
 	) {
 		super();
 
@@ -382,7 +386,13 @@ export class BrowserHostService extends Disposable implements IHostService {
 			this.shutdownReason = HostShutdownReason.Api;
 		}
 
-		await this.workspaceProvider.open(workspace, options);
+		const opened = await this.workspaceProvider.open(workspace, options);
+		if (!opened) {
+			const showResult = await this.dialogService.show(Severity.Warning, localize('unableToOpenExternal', "The browser prevented opening of a new tab or window. You must give permission to continue."), [localize('continue', "Continue"), localize('cancel', "Cancel")], { cancelId: 1 });
+			if (showResult.choice === 0) {
+				await this.workspaceProvider.open(workspace, options);
+			}
+		}
 	}
 
 	async toggleFullScreen(): Promise<void> {