This years version of Intuit TurboTax for the Web doesn't like Linux at all. They won't allow any browser in by default. Last year it worked just fine with Galeon on my Debian x86 box.
I went and added the user-agent plugin to my installation of Firefox and tried the IE setting. Unfortunately Intuit TurboTax uses some strange IE code that makes it so the page doesn't load.
Good thing I am not paying for using their silly system. If they didn't have my data from last year and it wasn't free I would go elsewhere.
The values I need to add for Firefox are:
general.appversion.override("5.0 (Windows; en-US)"
general.useragent.override("Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0")
In the User-Agent plugin I created a new user agent as follows:
Description: Firefox (Windows XP)
User Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0
App Name: Netscape
App Version: 5.0 (Windows; en-US)
Vendor Sub: 1.0