--- render/plugins/sifr.inc 
+++ render/plugins/sifr.inc 
@@ -375,14 +375,16 @@
 ";
   
   foreach ($rules as $rule) {
-    $fontsize       = trim($rule['fontsize']) ? "  font-size: $rule[fontsize];\n" : '';
-    $letterspacing  = trim($rule['letterspacing']) ? "  letter-spacing: $rule[letterspacing];\n" : '';
-    $rule['selector'] = str_replace(',', ', .sIFR-hasFlash ', $rule['selector']);
-    $output .= "
+    if ($rule['plugin'] == 'sIFR') {
+      $fontsize       = trim($rule['fontsize']) ? "  font-size: $rule[fontsize];\n" : '';
+      $letterspacing  = trim($rule['letterspacing']) ? "  letter-spacing: $rule[letterspacing];\n" : '';
+      $rule['selector'] = str_replace(',', ', .sIFR-hasFlash ', $rule['selector']);
+      $output .= "
 .sIFR-hasFlash $rule[selector] {
   visibility: hidden;
 $fontsize$letterspacing}
 ";
+    }
   }
   
   return $output;