When I navigate to the Namenode page, and I click on the "Datanodes" tab, it will take me to the Datanodes page. If I click my browser back button, it does not take me back to the overview page as one would expect. This is true of choosing any tab.
Another example of the back button acting weird is when browsing HDFS, if I click back one page, either the previous directory I was viewing, or the page I was viewing before entering the FS browser. Instead I am always taken back to the previous page I was viewing before entering the FS browser.