When making or modifying themes, you often check and debug CSS styles and layouts in the browser. If you are not familiar with DIV+CSS, you can easily view the theme's layout and styles by using Firefox's extension functions Firebug Besides, there is CSSViewer , which is also a FIREFOX plug-in that can preview the DIV layout of a web page. It can detect the CSS properties of the DIV on the web page, as shown in the figure:
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