Google search seems to have made https mandatory when logged in. This breaks history and the behaviour of the back button from the results page back to the google search results page. I think that this is because google, upon clicking on a result link, redirects to the results page via an intermediary, obfuscated url, which causes the back button to also redirect back to the result page. This is exactly the same problem as described here: https://support.mozilla.org/en-US/questions/892406?e=es&as=aaq for which there is no solution, as google doesn't allow us to disable https anymore. BTW, this behaviour is not replicted on chrome, i.e., back button works correctly in spite of the intermediate redirecting page.