How do I use Firebug to find out how many CSS files are being used on the page?

I recently came across this error in IE9 that says :-

"The maximum number os sty开发者_StackOverflow中文版le sheet on this page(31) has been reached. The browser will not load these excessive style sheets...."

Now on my website's master page, I have placed this Telerik control "RadStyleSheetManager" which is supposed to combine the style sheets if I am not wrong. I thought would solve the issue but no results.

Someone please point me towards the right direction. How do I find out the number of CSS files and how should I really use the RadStyleSheetManager to make my aspx pages load faster.

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In Firebug you can:

• open CSS tab to see all the files with their content
• open Net tab to see all the requests and find your CSS files there (filter using CSS button in the toolbar)

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you can look at the net tab in firebug to see all the request for css files