I know you can use "browser.urlbar.trimURLs" in about:config to re-enable the display of "http://" on URLs in the address bar, but I think there's an actual bug with hiding them in the address bar that should be corrected: When I click and drag in the address bar to select part of an address, including the beginning of the address, then use CTRL+C to copy it, and CTRL+V to paste it into something else, the pasted URL does not include "http://"; this is often inconvenient and will break in certain forms and so on. In Chrome--where I guess the http-hiding feature was copied from--if you click and drag to select part of the URL including the beginning, then copy, when you paste, the "http://," hidden in their address bar, *is* included. That's how it *should* work. Firefox's implementation is incomplete and frustrating.