diff --git a/modules/libpref/src/nsPref.cpp b/modules/libpref/src/nsPref.cpp
index 93d7679e8847..e048761b762f 100644
--- a/modules/libpref/src/nsPref.cpp
+++ b/modules/libpref/src/nsPref.cpp
@@ -1030,6 +1030,9 @@ PrefResult pref_OpenFileSpec(
 {
     PrefResult result = PREF_NOERROR;
 
+    if (NS_FAILED(fileSpec->ResolveSymlink()))
+      return PREF_ERROR;
+    
     if (!Exists(fileSpec))
         return PREF_ERROR;