
Take a closer look at it and read the explanation over on her blog, agile101.net...
Kelly.
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A 'Web Page Profiler' is a tool that is used to measure and analyze web page performance. It is usually implemented as a browser plugin or add-on, and lets you see performance of web pages/objects as they are transferred/loaded/executed/rendered.
For Firefox, choosing a profiler is a no-brainer. Firebug is an excellent developer tool that includes profiling capabilities.