User Agent: Mozilla/5.0 (Windows NT 6.1; rv:13.0) Gecko/20100101 Firefox/13.0.1 Build ID: 20120614114901 Steps to reproduce: 1. Go to an intranet site with a space in the URL: http://server/share/file name.html 2. Close the tab 3. Type part of the same URL in the address bar 4. Select the site from list of suggestions Actual results: Firefox used the URL as a search term in my default search engine: https://www.google.com/search?q=server%2Fshare%2Ffile+name.html Expected results: Firefox should have gone to http://server/share/file name.html The site loads correctly if you open it through the History window (ctrl-H), but not if you select it from the address bar. The problem goes away if you add the domain name to the server, eg. http://server.example.com/share/file name.html. Changing the spaces to %20's does not help (they change back to spaces when viewed in the history).

I believe that is expected. I don't believe whitespace is valid in URLs so Firefox interprets it as a web search (as designed). Moving to Fireofox::Location Bar so a developer can comment further.