gistfile1.js

XPCOMUtils.defineLazyGetter(DebuggerController, "_isRemoteDebugger", function() {
  // We're inside a single top level XUL window, not an iframe container.
  return !(window.frameElement instanceof XULElement) &&
    !!window._remoteFlag;
});

XPCOMUtils.defineLazyGetter(DebuggerController, "_isChromeDebugger", function() {
  // We're inside a single top level XUL window, but not a remote debugger.
  return !(window.frameElement instanceof XULElement) &&
    !window._remoteFlag;
});