User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:42.0) Gecko/20100101 Firefox/42.0 Build ID: 20151110142142 Steps to reproduce: I was often visiting a local development server under an address like this: project.localdomain:8080 This issue arises when I start typing the address. Actual results: Firefox suggests 'project.localdomain' for domain auto completion Expected results: Firefox suggests project.localdomain:8080' for domain auto completion. For reference, chrome does include the port number in domain auto completion.