Let's say that you don't like the Charles debugging tool because you have to pay a whole $50 for it. Don't panic, Fiddler does basically the same and yes, it is for free. Currently it's available only for Windows and it needs the .NET framework that you can download from their web site as well. The main benefits of this tool is the capacity to analyze all the background communication that goes on between the browser and the servers. I know what you are thinking about: Why not just use firefox and install Tamper Data? Well yes, that is a possibility. But if you are looking for a tool that won't freeze your browser (seems to be a common occurence with Tamper Data) then Fiddler can become handy. Professional SEOs absolutely need a web debugging tool like this in their toolbox.

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