diff --git a/extensions/github-authentication/src/githubServer.ts b/extensions/github-authentication/src/githubServer.ts
index a9f94ccf65d..a2ddbdc548f 100644
--- a/extensions/github-authentication/src/githubServer.ts
+++ b/extensions/github-authentication/src/githubServer.ts
@@ -114,11 +114,12 @@ export class GitHubServer implements IGitHubServer {
 		const supportedClient = isSupportedClient(callbackUri);
 		const supportedTarget = isSupportedTarget(this._type, this._ghesUri);
 
+		const isNodeEnvironment = typeof process !== 'undefined' && typeof process?.versions?.node === 'string';
 		const flows = getFlows({
 			target: this._type === AuthProviderType.github
 				? GitHubTarget.DotCom
 				: supportedTarget ? GitHubTarget.HostedEnterprise : GitHubTarget.Enterprise,
-			extensionHost: typeof navigator === 'undefined'
+			extensionHost: isNodeEnvironment
 				? this._extensionKind === vscode.ExtensionKind.UI ? ExtensionHost.Local : ExtensionHost.Remote
 				: ExtensionHost.WebWorker,
 			isSupportedClient: supportedClient
diff --git a/extensions/microsoft-authentication/src/extension.ts b/extensions/microsoft-authentication/src/extension.ts
index 6a5fac9765d..487f76c2cdc 100644
--- a/extensions/microsoft-authentication/src/extension.ts
+++ b/extensions/microsoft-authentication/src/extension.ts
@@ -71,8 +71,9 @@ export async function activate(context: ExtensionContext) {
 			commands.executeCommand('workbench.action.reloadWindow');
 		}
 	}));
+	const isNodeEnvironment = typeof process !== 'undefined' && typeof process?.versions?.node === 'string';
 	// Only activate the new extension if we are not running in a browser environment
-	if (useMsal && typeof navigator === 'undefined') {
+	if (useMsal && isNodeEnvironment) {
 		await extensionV2.activate(context, mainTelemetryReporter);
 	} else {
 		mainTelemetryReporter.sendActivatedWithClassicImplementationEvent();
diff --git a/extensions/microsoft-authentication/src/node/authProvider.ts b/extensions/microsoft-authentication/src/node/authProvider.ts
index 5ce9acd3e6a..4e72ce92b54 100644
--- a/extensions/microsoft-authentication/src/node/authProvider.ts
+++ b/extensions/microsoft-authentication/src/node/authProvider.ts
@@ -210,8 +210,9 @@ export class MsalAuthProvider implements AuthenticationProvider {
 			}
 		};
 
+		const isNodeEnvironment = typeof process !== 'undefined' && typeof process?.versions?.node === 'string';
 		const flows = getMsalFlows({
-			extensionHost: typeof navigator === 'undefined'
+			extensionHost: isNodeEnvironment
 				? this._context.extension.extensionKind === ExtensionKind.UI ? ExtensionHost.Local : ExtensionHost.Remote
 				: ExtensionHost.WebWorker,
 		});