You need to update Java to the latest version.

• http://blog.mozilla.com/addons/2012/04/02/blocking-java/

I just downloaded the latest version of Java. Thanks for your help.

You're welcome

Also, you should begin to prepare to upgrade to Firefox 11. Firefox 3.6 will be dropped from support in a few weeks, which means it will no longer be receiving security or stability updates. Firefox 11 is up to 7 times faster than 3.6, has lots of new features and improvements, as well as support for new web standards. http://www.mozilla.org/en-US/firefox/features/ and Updating Firefox have more information.

I've been reluctant to upgrade to Firefox 11 because I understand it will not look like my Firefox 3.6. I like the look and placement of my tool bars and menu bars, etc. Is there any way Firefox 11 can be tweaked to look like 3.6?

You can customize Firefox 11 to look like Firefox 3.6.

https://support.mozilla.org/en-US/kb/how-do-i-customize-toolbars can tell you how to change your toolbars, You can even get a theme that makes the colors the same as 3.6 like https://addons.mozilla.org/en-US/firefox/addon/firefox-3-theme-for-firefox