Many Thanks for posting this thread! Lots of useful info there. Knowledge is empowerment. Though Linux is much more secure than any version of Windows, security still must be of concern to all.
This OS, I frequently use when making purchases/online banking, it's a thin Linux client that can be ran via live CD or USB Flash drive, which is used by the US Air Force for secure computing. Ships with Firefox, Libre Office & Adobe Reader. Although it can be used as a general lightweight portable OS, it's recommended to reboot before prior to doing anything critical.
I initially ran across this OS on the US-CERT site a couple of years back & recommend it to anyone who wants a secure computing experience that's basically boot & run. Plus there's other security related materials on the site, including encryption tools that's free for the public.