Linux.com: Debug Your Web Code with Firebug

“Developing Web sites isn’t as straightforward a task as it used
to be at the turn of the century. With an influx of new tools,
technologies, and development methodologies, a Web page is no
longer a string of plain ol’ HTML, but instead a complex mix of
stylesheets, markup languages, and scripts. Debugging this
complicated blend is no easy task. Firebug is an open source add-on
to the Firefox Web browser that lets you edit and debug everything
from simple CSS and JavaScript templates to complex AJAX
applications.

“You can find several applications that assist Web developers in
creating and debugging projects…”

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