Added outline-style: none; to CSS to prevent Firefox from outlining links
diff --git a/user_guide/userguide.css b/user_guide/userguide.css
index 0f85000..57c2b05 100644
--- a/user_guide/userguide.css
+++ b/user_guide/userguide.css
@@ -12,16 +12,19 @@
  background-color: transparent;
  text-decoration: none;
  font-weight: normal;
+ outline-style: none;
 }
 a:visited {
  color: #0134c5;
  background-color: transparent;
  text-decoration: none;
+ outline-style: none;
 }
 a:hover {
  color: #000;
  text-decoration: none;
  background-color: transparent;
+ outline-style: none;
 }
 
 #breadcrumb {
@@ -96,18 +99,21 @@
  background-color: transparent;
  text-decoration: none;
  font-weight: normal;
+ outline-style: none;
 }
 
 #nav_inner a:visited {
  color: #eee;
  background-color: transparent;
  text-decoration: none;
+ outline-style: none;
 }
 
 #nav_inner a:hover {
  color: #ccc;
  text-decoration: none;
  background-color: transparent;
+ outline-style: none;
 }
 
 #masthead {