Firefox Add-ons
Web Developer
The Web Developer Extension is a extension for the Firefox browser and it’s a great tool for web designers. It has a variety off essential tools that allow you to code quality websites and troubleshoot problems easily. It’s a powerful all in one plugin. Web Developer extension adds a menu and a toolbar to the browser with various web developer tools. The added benefit of having Web Developer Tool is the ability to edit CSS on the fly. If you want to try a different font, different size, different color, background, borders, margins, padding, practically anything to do with CSS, you can make the changes in the Web Developer tool and see the changes instantly. The Web Developer tool saves you time when playing around with CSS.
Firebug
Codetech
Author description says it all. It’s the closest you can get to a professional web editing interface in a browser. Install it as an extension today and have a full featured editor right beside your web pages as you surf!
Greasemonkey
Greasemonkey is an addon for the Firefox browser that allows you to run scripts that alter the pages that are displayed to you for certain websites. Every time after the page has been loaded greasemonkey will apply the active script(s) to it. The scripts can be used to remove or add elements to the page because they can change the source code (HTML). This allows you to modify the functionality and design of any website that is displayed in your browser without control over the actual files on the web server.
This seems pretty dangerous behavior but all greasemonkey scripts are open source and its very easy to see on which sites/pages the script operates.
Greasemonkey is a unique extension in that it lets you install these things called user scripts. User scripts are much smaller than extensions, and are often targeted to much more specific tasks than extensions. There is a web site called UserScripts.org that is devoted to these small tiny hacks people have created to make the web work more like the way they want it to.
It can be complicated to create your own user scripts (it requires understanding the Javascript programming language), but it is dead simple to install and use scripts other people have created. And let me tell you that a *lot* of people have created scripts. There are over 7500 user scripts on UserScripts.org. If something on a web page has annoyed you, there is undoubtedly a user script that fixes it.
Greasemonkey is a Firefox extension that allows you to customize the way webpages look and function. Allows you to customize the way a webpage displays using small bits of JavaScript. Hundreds of scripts, for a wide variety of popular sites, are already available at http://userscripts.org. You can write your own scripts, too. Mark Pilgrim’s definitive Greasemonkey guide, diveintogreasemonkey.org will show you how.
CSS Validator/HTML Validator
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