User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0 Build ID: 20160922113459 Steps to reproduce: 1. open a new window/tab. 2. start typing an url (suggestions are shown) [e.g. http://site.one] 3. move a mouse (intentionally or not) 4. text is still show suggestion from p.2, suggested location under mouse pointer highlighted as well [e.g. http://site.two]. 5. hit enter button. Actual results: http://site.two is opened, I.e. suggestion selected by mouse although enter button was pressed. Expected results: If user press enter then open location corresponding to entered text (http://site.one). If user select suggestion with mouse, open that location (http://site.two).

Does it happen in safe mode? https://support.mozilla.org/kb/troubleshoot-firefox-issues-using-safe-mode

Hi, I have tested this issue on Windows 8.1 x64 with FF 49.0.2 release and I can't reproduce the issue. In my case the search is made after the text from URL bar, doesn't matter if I choose another suggestion with the mouse. Please note that I don't have any addons on this profile.