User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8) Gecko/20051111 Firefox/1.5 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8) Gecko/20051111 Firefox/1.5 Basically, when you close all of the tabs, the last tab you close will change to a blank page with (untitled) as its title, but still keeps its navigation history. In another word, you can stil click the back button to go back to wherever you were before. I think this is a bug because, effectively, when you close that last tab, it gives the impression of being a new tab, where in fact it has only loaded up a blank page to replace the old page, which is not what the "close tab" function is expected to do. Reproducible: Always Steps to Reproduce: 1. Uncheck "Hide the tab bar when only one web site is open" 2. Open any web page, e.g. http://www.mozilla.com/firefox/central/ 3. Close the tab with middle-click Actual Results: Pressing the Back button goes back to the Firefox Central page Expected Results: Pressing the Back button should do nothing

*** This bug has been marked as a duplicate of 281012 ***