--- a/dom/base/nsJSEnvironment.cpp
+++ b/dom/base/nsJSEnvironment.cpp
@@ -1317,17 +1317,16 @@ nsJSContext::nsJSContext(JSRuntime *aRun
         LocaleToLowerCase,
         LocaleCompare,
         LocaleToUnicode
       };
 
     ::JS_SetLocaleCallbacks(mContext, &localeCallbacks);
   }
   mIsInitialized = PR_FALSE;
-  mNumEvaluations = 0;
   mTerminations = nsnull;
   mScriptsEnabled = PR_TRUE;
   mOperationCallbackTime = 0;
   mModalStateTime = 0;
   mModalStateDepth = 0;
   mProcessingScriptTag = PR_FALSE;
 }
 
@@ -3518,27 +3517,21 @@ nsJSContext::ScriptEvaluated(PRBool aTer
     for (nsJSContext::TerminationFuncClosure* cur = start;
          cur;
          cur = cur->mNext) {
       (*(cur->mTerminationFunc))(cur->mTerminationFuncArg);
     }
     delete start;
   }
 
-  mNumEvaluations++;
-
 #ifdef JS_GC_ZEAL
   if (mContext->runtime->gcZeal >= 2) {
     JS_MaybeGC(mContext);
-  } else
+  }
 #endif
-  if (mNumEvaluations > 20) {
-    mNumEvaluations = 0;
-    JS_MaybeGC(mContext);
-  }
 
   if (aTerminated) {
     mOperationCallbackTime = 0;
     mModalStateTime = 0;
   }
 }
 
 nsresult

--- a/dom/base/nsJSEnvironment.h
+++ b/dom/base/nsJSEnvironment.h
@@ -240,17 +240,16 @@ protected:
   // reporting.
   void ReportPendingException();
 private:
   void DestroyJSContext();
 
   nsrefcnt GetCCRefcnt();
 
   JSContext *mContext;
-  PRUint32 mNumEvaluations;
 
 protected:
   struct TerminationFuncHolder;
   friend struct TerminationFuncHolder;
   
   struct TerminationFuncClosure
   {
     TerminationFuncClosure(nsScriptTerminationFunc aFunc,