Grumble Grumble Grumble

FireFox 1.0.1 is out, with some bug fixes, improved stability, and additions to help prevent Phishing attacks. It doesn't look like it's possible to update a FireFox 1.0 installation, you need to remove the existing FireFox installation and reinstall with the newer version (grumble grumble grumble...)

Mozilla FireFox 1.0.1 Release notes...
http://www.mozilla.org/products/firefox/releases/