Chromium on the Linux operating system!!
Yahoo recommends you upgrade your browser to enjoy all the features in the new Yahoo Mail; Google Chrome and Firefox. That is true on the Windows operating system. There are other operating systems out there that uses Safari and Chromuim as their browsers. I am currently on one of those machine and I don't understand why I should not be able to continue to use Chromuim ( = Google Chrome on a Linux machine ) as my browser.