Browsers and Add-ons
Use the following tools and browser add-ons to help identify class names and any issues with the performance or display of the SharePoint 2010 site.
Internet Explorer Developer Toolbar
This toolbar is a free tool that is built into Internet Explorer 8 and 9. You can also download and install it for workstations using Internet Explorer 7. To display the IE Developer Toolbar, simply press F12 on your keyboard at any time, or on the menu bar click on Tools 
F12 Developer Tools. The first time you display the toolbar it might be unpinned from the browser window, but you can dock it to the bottom of your browser window by pressing ...
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