User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.2; en-GB; rv:1.9b5) Gecko/2008032620 Firefox/3.0b5 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.2; en-GB; rv:1.9b5) Gecko/2008032620 Firefox/3.0b5 If there is more than 1 tab open and another child window open (like the downloads window), clicking the close button in the main Firefox window (the x in the top-right-hand corner) only asks if you are sure you want to close Firefox as there are several tabs. However, if I select File>Exit, the correct "Save and Quit" option dialog appears. Also, there is no dialog box of any kind (neither "Save and Quit" or "Close Tabs") if there is only 1 tab open. This means if you have navigated to a web page you want to return to, Firefox will not remember it unless you check the history log. Reproducible: Always Steps to Reproduce: No save and quit 1.Open Firefox 2.Create at least 1 new tab 3.Select Tools>Downloads 4.Click the close button on the main Firefox window (x in the top-right-hand corner) No dialog when closing 1.Open Firefox (ensure no other instances of Firefox are running or child-processes) 2.Go to any webpage (e.g news.bbc.co.uk) without creating a new tab or opening any other Firefox window. 3.Click the close button on the main Firefox window (x in the top-right-hand corner) or select File>Exit Actual Results: No save and quit A dialog box appears saying "You are about to close X tabs. Are you sure you want to continue?" with Close Tabs and Cancel as the options. No dialog when closing Firefox closes instantly without any dialog box. Expected Results: No save and quit A "Save and Quit" dialog box to appear, the same as when File>Exit is selected. No dialog when closing A "Save and Quit" dialog box to appear.

The first case you're describing is a duplicate of bug 417675. The second case is an intentional decision - we only show the quit dialog if more than one tab is open (or more than one window is open).

Apologies. I couldn't find a duplicate. Thanks.