diff --git a/extensions/pref/system-pref/src/gconf/nsSystemPrefService.cpp b/extensions/pref/system-pref/src/gconf/nsSystemPrefService.cpp
index 740580083660..1d3f548ac54b 100644
--- a/extensions/pref/system-pref/src/gconf/nsSystemPrefService.cpp
+++ b/extensions/pref/system-pref/src/gconf/nsSystemPrefService.cpp
@@ -441,11 +441,11 @@ NS_IMETHODIMP nsSystemPrefService::RemoveObserver(const char *aDomain, nsIObserv
     NS_ENSURE_SUCCESS(rv, rv);
 
     // need to find the index of observer, so we can remove it
-    PRInt32 count = mObservers->Count();
+    PRIntn count = mObservers->Count();
     if (count <= 0)
         return NS_OK;
 
-    PRInt32 i;
+    PRIntn i;
     SysPrefCallbackData *pCallbackData;
     for (i = 0; i < count; ++i) {
         pCallbackData = (SysPrefCallbackData *)mObservers->ElementAt(i);
@@ -591,7 +591,7 @@ GConfProxy::~GConfProxy()
     mInitialized = PR_FALSE;
 
     if (mGConfLib) {
-        // PR_UnloadLibrary(mGConfLib);
+        PR_UnloadLibrary(mGConfLib);
         mGConfLib = nsnull;
     }
     if (mObservers) {
@@ -734,11 +734,11 @@ GConfProxy::NotifyRemove (PRUint32 aAtom, const void *aUserData)
 {
     NS_ENSURE_TRUE(mInitialized, NS_ERROR_FAILURE);
 
-    PRInt32 count = mObservers->Count();
+    PRIntn count = mObservers->Count();
     if (count <= 0)
         return NS_OK;
 
-    PRInt32 i;
+    PRIntn i;
     GConfCallbackData *pData;
     for (i = 0; i < count; ++i) {
         pData = (GConfCallbackData *)mObservers->ElementAt(i);
diff --git a/extensions/pref/system-pref/src/nsSystemPref.cpp b/extensions/pref/system-pref/src/nsSystemPref.cpp
index 54e40d186bc6..71701d3dcd6a 100644
--- a/extensions/pref/system-pref/src/nsSystemPref.cpp
+++ b/extensions/pref/system-pref/src/nsSystemPref.cpp
@@ -234,16 +234,16 @@ nsSystemPref::UseSystemPrefs()
     SYSPREF_LOG(("\n====Now Use system prefs==\n"));
     nsresult rv = NS_OK;
     if (!mSysPrefService) {
-            return NS_ERROR_FAILURE;
+        return NS_ERROR_FAILURE;
     }
 
-    PRInt16 sysPrefCount= sizeof(sSysPrefList) / sizeof(sSysPrefList[0]);
+    PRIntn sysPrefCount= sizeof(sSysPrefList) / sizeof(sSysPrefList[0]);
 
     if (!mSysPrefs) {
         mSysPrefs = new SysPrefItem[sysPrefCount];
         if (!mSysPrefs)
             return NS_ERROR_OUT_OF_MEMORY;
-        for (PRInt16 index = 0; index < sysPrefCount; ++index)
+        for (PRIntn index = 0; index < sysPrefCount; ++index)
             mSysPrefs[index].SetPrefName(sSysPrefList[index]);
     }
 
@@ -252,7 +252,7 @@ nsSystemPref::UseSystemPrefs()
     if (!sysPrefBranchInternal)
         return NS_ERROR_FAILURE;
 
-    for (PRInt16 index = 0; index < sysPrefCount; ++index) {
+    for (PRIntn index = 0; index < sysPrefCount; ++index) {
         // save mozilla prefs
         SaveMozDefaultPref(mSysPrefs[index].prefName,
                            &mSysPrefs[index].defaultValue,
@@ -345,8 +345,8 @@ nsSystemPref::UseMozillaPrefs()
     if (!sysPrefBranchInternal)
         return NS_ERROR_FAILURE;
 
-    PRInt16 sysPrefCount= sizeof(sSysPrefList) / sizeof(sSysPrefList[0]);
-    for (PRInt16 index = 0; index < sysPrefCount; ++index) {
+    PRIntn sysPrefCount= sizeof(sSysPrefList) / sizeof(sSysPrefList[0]);
+    for (PRIntn index = 0; index < sysPrefCount; ++index) {
         // restore mozilla default value and free string memory if needed
         RestoreMozDefaultPref(mSysPrefs[index].prefName,
                               &mSysPrefs[index].defaultValue,