User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.13) Gecko/20060414 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.13) Gecko/20060414 After unchecking the "Warn me when closing multiple tabs" option in the dialog box, there's no option in the "Edit/Preferences/Tabbed Browsing" to re-enable this option. To re-enable we need to type "about:config" in a browser window and change the "browser.tabs.warnOnClose" option to "True" Reproducible: Always Steps to Reproduce: 1.in Mozilla, go to Edit/Preferences/Tabbed Browsing 2- there's no option to enable or disable the warning about closing multiple tabs Expected Results: it should have an easy way to re-enable the warning about closing multiple tabs To re-enable we need to type "about:config" in a browser window and change the "browser.tabs.warnOnClose" option to "True"

Duplicate of (already confirmed) bug 385141.