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Still using Firefox ? Here is a good list of firefox add-on

http://anidandesign.com/web-design/my-favorite-firefox-add-ons/

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Introduction

YSlow is a FREE tool analyzes web pages and tells you why they’re slow based on the rules for high performance web sites. YSlow is a Firefox add-on integrated with the popular Firebug web development tool. YSlow gives you:

• Performance report card
• HTTP/HTML summary
• List of components in the page
• Tools including JSLint

How can YSlow helps you ?

1. YSlow calculates the total size of the web page for both empty cache and primed cache scenarios, as well as information about cookies.
2. YSlow analyzes any web page and generates a grade for each rule and an overall grade. If a page can be improved, YSlow lists the specific changes to be made.
3. YSlow lists all the components in the page including their type, URL, Expires date, gzip status, load time, size, and ETag. You can also view the HTTP response headers for any component.

Screen shots

Installation

1. This is a Firefox plugin, you will need to install firefox 3 first.
2. Install Firebug.
3. Finally install YSlow .

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About author : This original article is property of Top 10 Web Hosting (http://www.top10webhosting.com). List of best web hosting services company offering PHP and MySQL. Compare & save ! on web hosting fee.

Note : Please include author information if you wish to republish this article.