Along with my security programs, I use HTTPS Everywhere, and Malwarebytes Anti-Exploit free, Disconnect, and Adblock Plus.
Where does that put me, in regards to the issue you just described?
Apparently, if you use Internet Explorer, you are OK. . . because it doesn't use the "Super Cookies" at all. . . which may be a good thing, or a bad thing. . . partly because it is not fully compatible with the latest standards.
On the other hand, this whole thing is a "proof of concept" and really NOT an exploit at all. . . but a potential that IF a SECURE website really wanted to track your comings and goings with the Super Cookie, which is not really its designed purpose, they could with special code on their website. According to the article, no one is doing this, but they could. However, if you delete the Super Cookie, you also turn off the ability to use encryption to these sites when you are in Privacy Mode connection. . . and any data being sent is in clear text. . . and you will be susceptible to a man-in-the-middle attack. If you trust the site with your Financial information and investments, you should be OK with them knowing it's you connecting and tracking when you connect.