I found Firebug, a plugin for Firefox, which could be very useful.
With this tool you can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page. It's also possible to test the performance of a loading page.
The download link is: http://www.getfirebug.com/
To use the full functionality of this web site, JavaScript needs to be turned on.
For best results, use the Firefox browser..
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