Nowadays lot's of effort is gone for testing and quality assurance of the web application which can be minimized by using web based testing tools available on the web.
There are lot's of Ad-ons available for mozila firfox for different kind of the testing which Includes such as iMacros for Firefox, WASP, Fireshot, Window Resizer, Selenium IDE, Web Developer, SwitchProxy, IE Tab, Molybdenum, HackBar, and many more.
Selenium IDE is an integrated development environment for Selenium tests.allows you to record, edit, and debug tests.You can choose to use its recording capability, or you may edit your scripts by hand.
Web Developer The Web Developer extension adds a menu and a toolbar to the browser with various web developer tools. It is designed for Firefox, Flock and Seamonkey, and will run on any platform that these browsers support including Windows, Mac OS X and Linux.
Hackbar allow you to test your web pages against sql injections, XSS holes and site security.It is not used for executing standard exploits.
These are few ad-ons which I use and It help me as a developer/tester to test website more rapidly.
Testing web Application
