Firefox can be one of your most powerful web developing tools. Plugins for FireFox are easy to use and can cut down time coding by hours, check out some of my favorites.
Firebug
Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page…
Web developer tool bar
Edit CSS on a page instantly, validate HTML/CSS/XML, clear cache instantly, view stylsheet information and much much more.
MeasureIt
Measure any area on a page in px with a click and drag of your mouse, comes very much in handy.
FireFTP
Add an FTP client straight to your FireFox browser.
Tamper Data
Use tamperdata to view and modify HTTP/HTTPS headers and post parameters. Trace and time http response/requests. Security test web applications by modifying POST parameters
User Agent Switcher
Ever wanted to test a page you built for the iPhone? The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of the browser.
Other cool plugins
Fox Tab
FoxTab is a 3D tabbed browsing extension. With 5 attractive layouts to choose from, fliiping between opened tabs becomes easy and enjoyable than ever. Use the grouping and filtering features, and start experiencing tabbed-browsing in a whole new way.
Stay tuned for more plugins as I find them
