A small good-to-know with FireBug

Like me, I think you like it, the FireBug. It is really nice, helpful when especilly you work with CSS.
But have you ever been frustrated when you work on those for hyperlinks i.e. a:link, a:hover etc?
You want to know which of the classes takes the effect when it appears on the browser, but it tells you that only when you click the element.
But with the case with a hyperlink, when you do so, what takes the effect is that of “hover”, not that takes the effect when the page is loaded.

I was very frustrated, helpless, but found out that just by coincident, after you once selected the element, if you refresh the page, it tells you the css class that takes the effect at the page load time.