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.

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)

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