5 Must Have Firefox Add-ons for Web Development
Firebug (version 1.2.0b4)
by Joe Hewitt, Firebug Working Group
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 (version 1.1.6)
by Chris Pederick
Adds a menu and a toolbar with various web developer tools.
MeasureIt (version 0.3.8)
by Kevin Freitas
Draw out a ruler to get the pixel width and height of any elements on a webpage.
ColorZilla (version 2 Beta)
by Alex Sirota
Advanced Eyedropper, ColorPicker, Page Zoomer and other colorful goodies
Screengrab! (version 0.95)
by Andy M
Screengrab saves entire webpages as images.It will save what you can see in the window, the entire page, just a
selection, a particular frame… basically it saves webpages as images.