As yet another entry in the long cavalcade of inexplicable user-hostile changes, Firefox for Android has stopped displaying anything but the TLD at the top of the screen, unless you explicitly edit it. The bugtracker thread makes it clear that this is a deliberate change, though none of the deliberation seems to have been public. My best non-conspiracy guess would be that it is rationalised with an argument along the lines of hypothetical users being fooled by phishing websites along the lines of http://www.fake.com/1/2/3/http/www.real.com/, but surely this would have been prevented by the default left-justification and could have been reinforced with colour if they were so concerned.