diff --git a/tests/config/debugControllerBackend.ts b/tests/config/debugControllerBackend.ts
index 7fc51f89e9..a018a295de 100644
--- a/tests/config/debugControllerBackend.ts
+++ b/tests/config/debugControllerBackend.ts
@@ -137,6 +137,10 @@ export class Backend extends EventEmitter {
     };
   }
 
+  async close() {
+    await this._transport.closeAndWait();
+  }
+
   async resetForReuse() {
     await this._send('resetForReuse');
   }
diff --git a/tests/library/debug-controller.spec.ts b/tests/library/debug-controller.spec.ts
index 22caeb4246..5242380705 100644
--- a/tests/library/debug-controller.spec.ts
+++ b/tests/library/debug-controller.spec.ts
@@ -38,13 +38,16 @@ const test = baseTest.extend<Fixtures>({
     const backend = new Backend();
     await backend.connect(wsEndpoint);
     await use(backend);
+    await backend.close();
   },
   connectedBrowser: async ({ playwright, wsEndpoint }, use) => {
+    const oldValue = (playwright.chromium as any)._defaultConnectOptions;
     (playwright.chromium as any)._defaultConnectOptions = {
       wsEndpoint,
       headers: { 'x-playwright-reuse-context': '1', },
     };
     const browser = await playwright.chromium.launch();
+    (playwright.chromium as any)._defaultConnectOptions = oldValue;
     await use(browser as any);
     await browser.close();
   },