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Firefox Web Developer Extension

By David Edelman on 03.29.07
Filed Under: Software

The Firefox Web Developer Extension is the best tool I've adopted in 2007. It makes testing a websites functionality and interface a breeze. Here are my nine favorite features - all available in one click!

1. View the CSS definitions that are effecting any element on the page.
2. Outline every block on the page to quickly identify the important structures.
3. Quickly resize the window to see what it looks like at different screen resolutions.
4. See what cookies the site is setting.
5. Disable javascript and see how your site looks to a search engine, older browsers, most cell phone users, etc.
6. Disable external images. What would your site look like if the image server went down?
7. Display all "alt" tags. (Perfect for SEO!)
8. Disable a stylesheet or edit one in real-time.
9. Check the page in multiple popular validation services.