Glyphicon changes height of input group addon

Created by: bassjobsen

<div class="input-group input-group-lg">
  <input type="text" class="form-control" placeholder="Username">
  <span class="input-group-addon"><span class="glyphicon glyphicon-star"></span></span>    
</div>

Shows in Firefox (23.0 for ubuntu) the span.glyphicon 1px to height, see:

Setting @padding-large-vertical to 9px will fix this issue. This possible cause many other issues.