If you're using the Firefox browser and haven't upgraded to 1.5.0.1 yet, what are you waiting for? There is a new update out for the best browser ever, fixing some potential security holes. From PC World:
Mozilla has released a new version of its Firefox browser containing critical security updates. Version 1.5.0.1 of the browser, released Wednesday, also contains a number of "stability" fixes to address problems that cause the browser to gum up the performance of some systems.
If you have at least version 1.5, you will be prompted to use the new automated update feature. There are 8 'highly critical' security fixes included with the newest update. Head over to the Firefox site (http://www.mozilla.com/firefox/) to get the latest version of the browser.