--- a/security/sandbox/mac/SandboxPolicies.h
+++ b/security/sandbox/mac/SandboxPolicies.h
@@ -180,17 +180,16 @@ static const char contentSandboxRules[] 
   (allow ipc-posix-shm-read* ipc-posix-shm-write-data
     (ipc-posix-name-regex "^AudioIO"))
 
   (allow signal (target self))
 
   (allow mach-lookup
       (global-name "com.apple.coreservices.launchservicesd")
       (global-name "com.apple.pasteboard.1")
-      (global-name "com.apple.window_proxies")
       (global-name "com.apple.audio.coreaudiod")
       (global-name "com.apple.audio.audiohald")
       (global-name "com.apple.SystemConfiguration.configd")
       (global-name "com.apple.iconservices")
       (global-name "com.apple.cache_delete"))
 
 ; bug 1376163
   (if (>= macosMinorVersion 13)