Index: themes/garland/style.css
===================================================================
RCS file: /cvs/drupal/drupal/themes/garland/style.css,v
retrieving revision 1.48
diff -u -p -r1.48 style.css
--- themes/garland/style.css	18 Feb 2009 14:28:25 -0000	1.48
+++ themes/garland/style.css	14 Mar 2009 17:47:47 -0000
@@ -971,6 +971,17 @@ tr.taxonomy-term-divider-bottom {
   border-top: 1px dotted #CCC;
 }
 
+@-moz-document url-prefix() {
+  table#blocks tr.region-message {
+    display: table-row;
+    visibility: collapse; 
+  }
+
+  table#blocks tr.region-empty {
+    visibility: visible;
+  }
+}
+
 /**
  * CSS support
  */