--- a/embedding/components/webbrowserpersist/nsWebBrowserPersist.cpp
+++ b/embedding/components/webbrowserpersist/nsWebBrowserPersist.cpp
@@ -2008,17 +2008,17 @@ nsWebBrowserPersist::CalculateUniqueFile
     // Create a filename if it's empty, or if the filename / datapath is
     // already taken by another URI and create an alternate name.
 
     if (base.IsEmpty() || !mFilenameList.IsEmpty())
     {
         nsAutoCString tmpPath;
         nsAutoCString tmpBase;
         uint32_t duplicateCounter = 1;
-        while (1)
+        while (true)
         {
             // Make a file name,
             // Foo become foo_001, foo_002, etc.
             // Empty files become _001, _002 etc.
 
             if (base.IsEmpty() || duplicateCounter > 1)
             {
                 char * tmp = PR_smprintf("_%03d", duplicateCounter);