At some point fairly recently, the URLs shown in the Firefox location bar dropped the protocol prefix -- urls appear as "askubuntu.com" not "http://askubuntu.com" -- if the site is https://... the prefix does appear, but I'd like to see it all the time.
How do I get that back?
Its considered a "feature" since version 7.
To turn it off type on the address bar
about:config, look for browser.urlbar.trimURLs and set the value to false.