Great web development plugin for Mozilla that ads a number of additional web development tools and functions to your Mozilla. You must try this one.
An amazing and very useful plugin that helps you to resize and view the webpage in different resolutions like 640×480, 800×600, 1024×768, 1280×1024 and 1600×1200 resolutions.
This simple plugin enables to take quick screenshots when you want to design tutorials or walkthrough on your blogs and website.
Advanced Eyedropper, Color Picker, Palette Viewer and other colorful goodies for your Firefox. This extension allows you to pick colors from the web, past the color codes, zoom, etc. This is an excellent add on every web designer / developer should have.
FireFTP is a free, secure, cross-platform FTP client for Mozilla Firefox which provides easy and intuitive access to FTP servers.
this is more a testing plugin than a development or design plugin. This basically embeds the IE in the Mozilla as a tab so that your website could be previewed both in IE and Mozilla simultaneously.
An excellent light weight tool that solves one of the most common issues that a web designer faces – measuring from browser. This plugin lets you to measure the height and width of web page elements right from the browser itself.
View Source Chart
Gives more clarity and structured arrangement of your nested codes and source of the web page that you are working on.
Load Time Analyzer
A detailed loading time analyzing addon that would give you the break down of the parts of your website that is eating up the time and graphically show you a report as well.
A great plugin that could be an aid to your validation and bug fixing when it comes to HTML validation of your web page.