I use Firefox to write local applications on my laptop. When doing so the URL always begins with file:///. When a local document is opened the output of document.domain is "domain." If I disable popup blocker my local html based application creates a new browser window and then two additional windows are opened in new tabs. This is what I want but I do not want to disable popup blocker, I want to add an exception. If popup blocker is enabled then only the new browser window is displayed.