diff --git a/build_apprtc_closure.py b/build_apprtc_closure.py
index 4dae3c3..1a1f2ee 100755
--- a/build_apprtc_closure.py
+++ b/build_apprtc_closure.py
@@ -27,7 +27,7 @@
 
     for line in fileinput.input(package_json, inplace=True):
       if not 'phantomjs' in line:
-        print line
+        sys.stdout.write(line)
 
 
 def main():
diff --git a/copy_apprtc.py b/copy_apprtc.py
index 5a9a3c9..538e50f 100755
--- a/copy_apprtc.py
+++ b/copy_apprtc.py
@@ -10,25 +10,45 @@
 understand those symlinks).
 """
 
+import fileinput
 import os
 import shutil
+import sys
 
 import utils
 
-if __name__ == '__main__':
-  target_dir = os.path.join('src', 'out', 'webrtc-samples')
-  if utils.GetPlatform() is 'win':
-    # Work around the fact that node_modules create ridiculously long paths.
-    # Unfortunately shutil will choke on those on Windows, but not rmdir.
-    os.system('rmdir /s /q %s' % target_dir)
-  else:
-    shutil.rmtree(target_dir, ignore_errors=True)
+
+def _ConfigureApprtcServerToDeveloperMode(apprtc_dir):
+  app_yaml_path = os.path.join(apprtc_dir, 'app.yaml')
+  if not os.path.exists(app_yaml_path):
+    return 'Expected app.yaml at %s.' % os.path.abspath(app_yaml_path)
+
+  for line in fileinput.input(app_yaml_path, inplace=True):
+    # We can't click past these in the firefox interop test, so
+    # disable them.
+    line = line.replace('BYPASS_JOIN_CONFIRMATION: false',
+                        'BYPASS_JOIN_CONFIRMATION: true')
+    sys.stdout.write(line)
+
+
+def _CopyApprtcToTargetDir(target_dir, apprtc_subdir):
+  shutil.rmtree(target_dir, ignore_errors=True)
   shutil.copytree('webrtc-samples',
                   target_dir, ignore=shutil.ignore_patterns('.svn', '.git'))
-  apprtc_subdir = os.path.join('samples', 'web', 'content', 'apprtc')
 
   # This file is symlinked on windows, so copy it since win doesn't understand
   # symlinks.
   shutil.copyfile(os.path.join('webrtc-samples', 'samples', 'web',
                                'js', 'adapter.js'),
                   os.path.join(target_dir, apprtc_subdir, 'js', 'adapter.js'))
+
+
+def main():
+  target_dir = os.path.join('src', 'out', 'webrtc-samples')
+  apprtc_subdir = os.path.join('samples', 'web', 'content', 'apprtc')
+  _CopyApprtcToTargetDir(target_dir, apprtc_subdir)
+  _ConfigureApprtcServerToDeveloperMode(os.path.join(target_dir, apprtc_subdir))
+
+if __name__ == '__main__':
+  sys.exit(main())
+