If you are a web site developer, you may concern if your web application is safe for attacks or not. If you are a web application user, you may concern if your web application is also safe for attacks.
If you web application works with SQL, you may interest in these Firefox addons. They are developed by Security Compass. These are a suite of Firefox web application security testing tools designed to be lightweight and easy to use.
These addons including
SQL Injection Meand
XSS Meas well as
Security Compass - Exploit-Me official site
Firefox addons site
That's all. See you!