It has been reported and confirmed that when using WebSockets in Safari with Auto Proxy Discovery enabled the browser can crash. This has been confirmed as a bug in Safari and has been reported to Apple as
Bug ID# 8244376.
*Update: 12 March 2012** - We recently unsuccessfully to duplicate this problem on a number of Safari Browsers. It may be fixed although we cannot 100% confirm this.
There is presently no simple resolution to this problem as this is a bug in the Safari Browser.