Index: firefox.in
===================================================================
--- firefox.in (nonexistent)
+++ firefox.in (revision 383)
@@ -0,0 +1,9 @@
+#!/bin/sh
+#
+# Shell script to start Mozilla Firefox.
+#
+# Don't reset the user profile on a detected browser downgrade:
+export MOZ_ALLOW_DOWNGRADE=1
+
+# Start Firefox:
+exec /usr/lib@LIBDIRSUFFIX@/firefox/firefox "$@"