User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.5) Gecko/20031007 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.5) Gecko/20031007 in 1.5, when multiple tabs are open and you want to close the browser, you get a confirmation dialog asking you if you want to close all tabs. There is also a checkbox if you don't want to be asked again. If you check this option, there's no way to re-enable the feature. I would expect to find the option in Preferences-> Navigator-> Tabbed Browsing Reproducible: Always Steps to Reproduce: 1. Open multiple browsers 2. Close the browser. When the confirmation dialog comes up (unless already disabled), check off the box to "not ask again." Actual Results: There's no way to re-enable the confirmation dialog. Expected Results: I would expect to find an option in Preferences-> Navigator-> Tabbed Browsing to re-enable the confirmation dialog

Steps to reproduce should start with: 1. Open multiple *tabs*

In the location bar, type about:Config and hit enter. Scroll down to browser.tabs.warnOnClose. Doublie click on it and replace false with true.

Well, that is where it can manually be fixed, but you would still expect the option in Preferences. Thanks.

See comment 146 of bug 108973.

*** Bug 226029 has been marked as a duplicate of this bug. ***

dupe, per comment 4. *** This bug has been marked as a duplicate of 108973 ***