Firebug pales out those elements that are invisible or hidden from view in the browser. According to your example shown here. There are 2 types of HTML elements that are invisible / pale.
<input type="hidden" />
is as the name suggests hidden type and is never shown on the page but can contain some important data for other functionality of the web page.- There is a
<div>
element which does not contain any content, nor it has its height or width defined. So what do you expect to show for that div?
EDIT:
If you want them to be shown on your webpage then:
For <input type="hidden" />
you can copy its value
to some other elements to show what it contains. You can do this using javascript or jQuery.
For the <div>
element. Either add some content to it like:
<div class="ui-icon">
Your content
</div>
or specify its size (i.e. height and width) also display it as block with some border.
<div class="ui-icon" style="hieght:10px;
width:100px; display: block; border: 1px solid red">
</div>