Firebug's Net panel is well known and indispensable tool for debugging and testing page load performance. Its purpose is to provide detailed timing information about HTTP traffic initiated by a web page.

Also, all data collected by the Net panel can be exported into a HAR file and processed by other tools (e.g. you can use online viewer for preview).

Finally, it's also possible to automate the entire page-load-test-and-export process using Selenium. So, if it sounds interesting to you read more about how to setup Firebug, NetExport and Selenium to automatically measure performance of your site!

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