The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser. Firefox 専用 — 今すぐ Firefox をダウンロード
![User Agent Switcher :: Firefox Add-ons](https://cdn-ak-scissors.b.st-hatena.com/image/square/8d464cd415abb73ad4f87493875e71db74986a54/height=288;version=1;width=512/https%3A%2F%2Faddons.cdn.mozilla.net%2Fuser-media%2Fpreviews%2Ffull%2F19%2F19212.png%3Fmodified%3D1530207921)
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
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