diff --git a/brozzler/browser.py b/brozzler/browser.py
index 4a89795..dcbf0e6 100644
--- a/brozzler/browser.py
+++ b/brozzler/browser.py
@@ -520,15 +520,11 @@ class Browser:
     def configure_browser(self, extra_headers=None, user_agent=None):
         headers = extra_headers or {}
         headers['Accept-Encoding'] = 'gzip'  # avoid encodings br, sdch
-        self.websock_thread.expect_result(self._command_id.peek())
-        msg_id = self.send_to_chrome(
+        self.send_to_chrome(
                 method='Network.setExtraHTTPHeaders',
                 params={'headers': headers})
-        self._wait_for(
-                lambda: self.websock_thread.received_result(msg_id),
-                timeout=10)
         if user_agent:
-            msg_id = self.send_to_chrome(
+            self.send_to_chrome(
                     method='Network.setUserAgentOverride',
                     params={'userAgent': user_agent})