Near line 310 of the DebuggerSidebarPanel.js file is this call: this._addBreakpoint(breakpoints[i], sourceCode); However this function begins: _addBreakpoint: function(breakpoint, sourceCode) { var sourceCode = breakpoint.sourceCodeLocation.displaySourceCode; Clearly this second parameter is unnecessary.
<rdar://problem/19603573>
<rdar://problem/19603574>
The function in question has changed since this was filed, and this is no longer an issue.