When developing a Web application, it's standard practice to create a database structure on which server-side code is placed for the logic and UI layers. To connect to the database, the server-side code needs to do some basic creating, updating, deleting, and — most importantly — reading of records.
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Aardvark - A cool extension for web developers and designers, allows them to view CSS attributes, id, class by highlighting page element individually. chromEdit - Alter the appearance of any page by editing CSS and Javascript files with this extension. CSSMate - Firefox extension to edit CSS files.
CSS validator - Check the validity of your webpage using this CSS validator extension. CSSViewer - See the CSS properties of page elements with this extension.
EditCSS - Play around with loaded CSS, Web Developer extension also provides this functionality.
IE Tab - Designers and developers can view their CSS projects on Internet Explorer using this extension.
Style Sheet Chooser II - Users can pick and choose alternate style sheets for a website. FireBug - A console for debugging JavaScript, HTML, and Ajax code snippets. HTML Validator - Cool extension to validate web pages with HTML standards of W3C. JavaScript Debugger - JavaScript debugging extension enables a strong debugging environment.