I don't like the fact that Firefox hides the "http://" from the URL bar and when I copy and paste the URL, it adds that back; thus stressing my copy-and-pasted skills up.
To go back to the previous behavior of showing the protocol, visit:
about:config
on your Firefox and search for:
browser.urlbar.trimURLs
change the value to false:
browser.urlbar.trimURLs = false
And you're good right away!