disable console option ShowStackTrace if Debugger is disabled. Fix  Issue 660:	 Show Stack Trace with Errors doesn't work in 1.2.0a25X
disable console option ShowStackTrace if Debugger is disabled.
Fix  Issue 660:	 Show Stack Trace with Errors doesn't work in 1.2.0a25X

http://code.google.com/p/fbug/source/detail?r=722

firebug/tracing-console,firebug/tracing-console