There's a new release of Firefox (1.0.1) which apparently fixes a few security holes. Details of the fixes can be found here. The simplest way to update: Tools, Options, Advanced. Under the Software Updates section, there's a button labeled Check Now, which will automatically download the new version, close Firefox, and run the install. If you've had any issues with Firefox, another way to install would be to uninstall Firefox 1.0, then go here to download and install the new version. This should fix any problems related to a corrupted profile (the most common cause of issues with Firefox). Note, that if you do this, you will lose any history, bookmarks, etc. But you can always re-import from IE when you install 1.0.1.
Jeff
Jeff