diff --git a/brozzler/browser.py b/brozzler/browser.py
index aaff56e..585e8e9 100644
--- a/brozzler/browser.py
+++ b/brozzler/browser.py
@@ -34,6 +34,7 @@ from requests.structures import CaseInsensitiveDict
 import select
 import re
 import base64
+import psutil
 
 __all__ = ["BrowserPool", "Browser"]
 
@@ -127,6 +128,7 @@ class Browser:
     def start(self, proxy=None):
         if not self._chrome_instance:
             # these can raise exceptions
+            self.chrome_port = self._find_available_port()
             self._work_dir = tempfile.TemporaryDirectory()
             self._chrome_instance = Chrome(port=self.chrome_port,
                     executable=self.chrome_exe,
@@ -151,6 +153,19 @@ class Browser:
         except:
             self.logger.error("problem stopping", exc_info=True)
 
+    def _find_available_port(self):
+        port_available = False
+        port = self.chrome_port
+        while not port_available:
+            for connection in psutil.net_connections(kind='tcp'):
+                if connection.laddr[1] == port:
+                    self.logger.warn("Port already open %s", port)
+                    port_available = False
+                    port += 1
+                    break
+            port_available = True
+        return port
+
     def is_running(self):
         return bool(self._websocket_url)