YSlow – Get this Extension for 🦊 Firefox (ja)YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages. YSlow is available for Firefox as an 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 compon
