app/frameworks/twitter/bootstrap/button-groups.less in less-rails-bootstrap-3.3.0.1 vs app/frameworks/twitter/bootstrap/button-groups.less in less-rails-bootstrap-3.3.1.0

@@ -16,13 +16,9 @@
     &:focus,
     &:active,
     &.active {
       z-index: 2;
     }
-    &:focus {
-      // Remove focus outline when dropdown JS adds it after closing the menu
-      outline: 0;
-    }
   }
 }
 
 // Prevent double borders when buttons are next to each other
 .btn-group {