$OpenBSD: patch-toolkit_xre_nsXREDirProvider_cpp,v 1.16 2012/11/24 10:21:50 landry Exp $
Look for extensions in LOCALBASE
--- toolkit/xre/nsXREDirProvider.cpp.orig	Wed Oct 17 16:33:09 2012
+++ toolkit/xre/nsXREDirProvider.cpp	Wed Oct 17 21:59:04 2012
@@ -1186,11 +1186,7 @@ nsXREDirProvider::GetSystemExtensionsDirectory(nsIFile
   NS_ENSURE_SUCCESS(rv, rv);
 #elif defined(XP_UNIX)
   static const char *const sysSExtDir = 
-#ifdef HAVE_USR_LIB64_DIR
-    "/usr/lib64/mozilla/extensions";
-#else
-    "/usr/lib/mozilla/extensions";
-#endif
+    "${LOCALBASE}/lib/mozilla/extensions";
 
   rv = NS_NewNativeLocalFile(nsDependentCString(sysSExtDir), false,
                              getter_AddRefs(localDir));