One of the tools that I use daily is the Firefox add-on Firebug. If you’re dealing with web development in any way, Firebug will give you an enormous wealth of information and tools:
monitor how long it takes for each component of your web page to load; edit css and html with a live preview; debug javascript errors; analyze DOM, and more. Although this is a plug-in, it has its own environment of extensionsto add even more to the fun.
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