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I want a Firefox add-on to know where time is being spent in my Web Application.

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up vote 4 down vote accepted

Check out Yahoo's YSlow, it works in combination with the Firebug Firefox addon.

YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages. YSlow is a Firefox add-on integrated with the Firebug web development tool. YSlow grades web page based on one of three predefined ruleset or a user-defined ruleset. It offers suggestions for improving the page's performance, summarizes the page's components, displays statistics about the page, and provides tools for performance analysis, including™ and JSLint.

Another option is the Charles web debugging proxy. It's a very useful tool for web application development in general (both javascript and flash), and one of the features is a chart showing all the objects/requests loaded, and the time they take.

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Thankx a lot :) – Wahid Bitar Dec 12 '09 at 10:03

Page Speed (again with Firebug) would be another option.

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There is the new Speed Tracer by Google.

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It needs Google chrome and not work with Firefox. isn't ? – Wahid Bitar Dec 26 '09 at 15:52
Yes. It's a Chrome/Chromium extension. I'm sorry it's not exactly an answer. – alfplayer Dec 26 '09 at 19:06

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