There seems to be a change in behavior in the order of results presented in the awesomebar. For example, if I type "z" in the awesomebar, the first result displayed in the dropdown for me used to be Zimbra (with url mail.mozilla.com/zimbra), but now it's Zappos (with url zappos.com), even though that's a website I visit a lot less often. I believe this is a recent change in behavior, but I don't know if it's intentional or not. If it's not, I can find a regression range. Note: this is unrelated to the autocomplete value. I'm talking about the first result presented by the awesomebar (which my muscle memory access directly through pressing letter, tab, enter)

If you have set browser.urlbar.unifiedcomplete = false in about:config, would you please check the behavior ?

Thanks Alice. Indeed, you are correct. With browser.urlbar.unifiedcomplete = false, this bug doesn't happen.