diff --git a/data/templates/top.inc.php b/data/templates/top.inc.php
index bdd4b1a..a20348a 100644
--- a/data/templates/top.inc.php
+++ b/data/templates/top.inc.php
@@ -1,5 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd" [
+  <!ENTITY % xhtml-symbol
+    PUBLIC "-//W3C//ENTITIES Symbols for XHTML//EN"
+    "http://www.w3.org/MarkUp/DTD/xhtml-symbol.ent">
+  <!-- firefox bitches on that reference above and does not load it -->
+  <!ENTITY larr     "&#8592;" ><!-- leftwards arrow, U+2190 ISOnum -->
+%xhtml-symbol;
+]>
 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
  <head>
   <meta http-equiv="Content-Type" content="application/xhtml+xml; charset=utf-8" />
