Firefox附加組件

The Firefox Web Developer add-on is a must have for webmasters to quickly check a variety of things about a website.
Examine Headers with this handy little add-on.
To easily check your website’s speed, install the Google Page Speed add-on for Firefox. It performs several tests on a website server configuration and front-end code. The tests are based on a set of best practices, that Google recommend, known to enhance web page performance. You get a set of scores for each page as well as helpful suggestions on how to improve the website’s performance.