Created attachment 8470277 [details] screencap.mp4 STR: Have two URLs, one of them previously visited. In my case: http://en.wikipedia.org/wiki/Lens_flare http://en.wikipedia.org/wiki/Google In the locationbar, start to type en.wikipedia... and then select one of them with the arrow-buttons. Click somewhere in the empty tabbar to close the results-pane. Replace the last part of the URL with the previously copied string. In my case: "Google" replaces "Lens_flare". Hit enter. ER: The URL with the replaced string is visited. In my case, the wikipedia-page for Google should be visited. AR: The initially selected URL is visited. In my case that the page for lens flare. Setting browser.urlbar.unifiedcomplete to false reverts this problem.
This is a bit hard to reproduce (probably because I'm too slow), but I've been able to reproduce it once.
the behavior changed recently with bug 1050683 and bug 1051830, would be good to know if this can still be reproduced in currently Nightly builds.
Last bad revision: 70be728521e3 (2014-08-10) First good revision: a9b43778f0c2 (2014-08-11) Pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=70be728521e3&tochange=a9b43778f0c2 Last bad revision: e4f87d728f9d First good revision: bb954a9a154f Pushlog: https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=e4f87d728f9d&tochange=bb954a9a154f So probably bug 1050683 fixed it.