If you have a vulnerable version of Java installed here is what you need to do.
Type in: “chrome://plugins/” into the address bar. Scroll down to Java and click disable.
Press Firefox button- Add-ons, go to Plugins and click the disable button next to anything named Java.
Type in opera:plugins into the address bar. Scroll to: Java Platform and Java Deployment Toolkit and disable them both.
Press the left-alt key to open the menu. Click Tools | Internet Options | Advanced. If Java is installed in your browser, you will see a listing for Sun Java in the Internet Options menu. Un-check it to disable.