--- a/dom/src/base/nsJSEnvironment.cpp
+++ b/dom/src/base/nsJSEnvironment.cpp
@@ -1167,22 +1167,16 @@ nsJSContext::JSOptionChangedCallback(con
 
   nsIScriptGlobalObject *global = context->GetGlobalObject();
   // XXX should we check for sysprin instead of a chrome window, to make
   // XXX components be covered by the chrome pref instead of the content one?
   nsCOMPtr<nsIDOMChromeWindow> chromeWindow(do_QueryInterface(global));
   PRBool useJIT = nsContentUtils::GetBoolPref(chromeWindow ?
                                               js_jit_chrome_str :
                                               js_jit_content_str);
-
-#ifdef MOZ_JSDEBUGGER
-  if (context->mContext->debugHooks->debuggerHandler)
-    useJIT = PR_FALSE;
-#endif
-
   if (useJIT)
     newDefaultJSOptions |= JSOPTION_JIT;
   else
     newDefaultJSOptions &= ~JSOPTION_JIT;
 
 #ifdef DEBUG
   // In debug builds, warnings are always enabled in chrome context
   // Note this callback is also called from context's InitClasses thus we don't