Firefox Plugins Every Developer Should Have
First there were intelligent IDE's. Second, there were javascript frameworks and php and ruby frameworks. We have all been 'handed-down' with awesome tools to get our work done as humanely possible.
It's no surprise that even our browsers have 'tools' to help us work smarter resulting in faster web development time.
Web Development Toolbar

The web development toolbar was the first of its kind to be used by almost every developer in the industry. Why wouldn't it be? It has almost all the essential tools in managing cache, CSS and HTML. It has useful shortcuts to validate your website markup and CSS.
Firebug

An amazing firefox plugin that helps you edit, debug javascript and html. It's a wonderful checker for AJAX response and requests.
YSlow
Do you have a slow loading website? 'Y Slow'? YSlow is a firebug plugin extension developed by Yahoo. It runs your website through a test to determine what factors can be improved to increase loading.
Photo credit: Mozilla Add-ons, Chris PederickCategories: Web Development
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