I had my options set to ask me before downloading or installing updates. I was delaying downloading 4.0.1 until the issue with Norton Toolbar is resolved. Today, Firefox downloaded the update anyway and will install the next time I restart Firefox. How do I prevent the installation? And how did my options get changed to automatically download and install, as I later discovered. I am POSITIVE that I did not change them and the update had been asking to install prior to today.