The Web Developer plugin is a really usefull extension for Mozilla and Firefox. It adds a toolbar with a lot of usefull tools for web developers. I installed it because i wanted an easy way to see the HTTP headers sent by my web server. Using the web developer pluging these are easily displayed by selecting “information | view response headers”. Also usefull is the “Validate Local HTML” function, which will validate a page, even if it’s only available on your intranet. Another function i’ve been using is “Display Form Details” which will show the source code for form tags in your page. You don’t need to search in your source code anymore, it’s simple displayed with the form element on your page. Great stuff!