The tracking protection shield in firefox for android only appears on the first page I go to on a site. Any subsequent pages I go to do not have the shield, including if I go back to the original page. For example, I just opened theguardian.com and the shield appeared. I then clicked on an article and the shield icon was not present next to the url for that page. I then went back to the front page of the website and the shield was not present in the url bar. Is the tracking protection feature not working properly, or is the shield only supposed to appear the first time a user connects to a site?