--- a/toolkit/xre/nsAppRunner.cpp
+++ b/toolkit/xre/nsAppRunner.cpp
@@ -3191,19 +3191,17 @@ XREMain::XRE_mainInit(bool* aExitFlag)
 
 #ifdef MOZ_ASAN_REPORTER
   // In ASan Reporter builds, we enable certain chaos features by default unless
   // the user explicitly requests a particular set of features.
   if (!PR_GetEnv("MOZ_CHAOSMODE")) {
     ChaosMode::SetChaosFeature(static_cast<ChaosFeature>(
                                ChaosFeature::ThreadScheduling
                                | ChaosFeature::NetworkScheduling
-                               | ChaosFeature::TimerScheduling
-                               | ChaosFeature::TaskDispatching
-                               | ChaosFeature::TaskRunning));
+                               | ChaosFeature::TimerScheduling));
   }
 #endif
 
   if (ChaosMode::isActive(ChaosFeature::Any)) {
     printf_stderr("*** You are running in chaos test mode. See ChaosMode.h. ***\n");
   }
 
   if (CheckArg("headless") || CheckArgExists("screenshot")) {