test/css2.1/blocking/at-rule-013: firefox bug 604175

Author: tantek

test/css2.1/blocking/at-rule-013.txt

@@ -7,7 +7,7 @@
 Requires support for ******. Works in:
   * IE9 Beta build 7930
 Runs but fails in:
-  * Firefox ...
+  * Firefox - see [[https://bugzilla.mozilla.org/show_bug.cgi?id=604175|bug 604175]]
   * Opera ...
   * WebKit ...