diff --git a/modules/libpref/Preferences.cpp b/modules/libpref/Preferences.cpp
index 118eeb64b4e..e5eb4bf477c 100644
--- a/modules/libpref/Preferences.cpp
+++ b/modules/libpref/Preferences.cpp
@@ -960,7 +960,6 @@ Preferences::WritePrefFile(nsIFile* aFile)
   memset(valueArray, 0, gHashTable->EntryCount() * sizeof(char*));
   pref_saveArgs saveArgs;
   saveArgs.prefArray = valueArray;
-  saveArgs.saveTypes = SAVE_ALL;
 
   // get the lines that we're supposed to be writing to the file
   PL_DHashTableEnumerate(gHashTable, pref_savePref, &saveArgs);
diff --git a/modules/libpref/prefapi.cpp b/modules/libpref/prefapi.cpp
index 8b603e25b1f..e5428476ec8 100644
--- a/modules/libpref/prefapi.cpp
+++ b/modules/libpref/prefapi.cpp
@@ -343,13 +343,8 @@ pref_savePref(PLDHashTable *table, PLDHashEntryHdr *heh, uint32_t i, void *arg)
          pref->flags & PREF_STICKY_DEFAULT)) {
         sourcePref = &pref->userPref;
     } else {
-        if (argData->saveTypes == SAVE_ALL_AND_DEFAULTS) {
-            prefPrefix.AssignLiteral("pref(\"");
-            sourcePref = &pref->defaultPref;
-        }
-        else
-            // do not save default prefs that haven't changed
-            return PL_DHASH_NEXT;
+        // do not save default prefs that haven't changed
+        return PL_DHASH_NEXT;
     }
 
     // strings are in quotes!
diff --git a/modules/libpref/prefapi_private_data.h b/modules/libpref/prefapi_private_data.h
index 82141adcefd..c288edcfc81 100644
--- a/modules/libpref/prefapi_private_data.h
+++ b/modules/libpref/prefapi_private_data.h
@@ -19,12 +19,9 @@ class PrefSetting;
 }
 }
 
-enum pref_SaveTypes { SAVE_NONSHARED, SAVE_SHARED, SAVE_ALL, SAVE_ALL_AND_DEFAULTS };
-
 // Passed as the arg to pref_savePref
 struct pref_saveArgs {
   char **prefArray;
-  pref_SaveTypes saveTypes;
 };
 
 PLDHashOperator