A couple days ago Mozilla release its Firefox 4 Browser. Some key features to the new release make it faster, enhanced security, and more customizable for users. Click here to see WHAT’s NEW.
Keep in mind, if you choose to download it some of your old plug-ins may not be compatible. I am not sure if there are any previous plug-ins that are not being supported via updated releases. You might want to look into that if you have a favourite plug-in, or at least have a copy of the old Firefox still available.