If that happened, one needs to re-enable it in Options/Preferences as documented in the ] support article - it should then be available. The option to show a warning dialog when closing multiple tabs in the Firefox options/preferences was changed to appear conditionally in order to free up space in the user interface, so it’s only available after the option itself has been ''unchecked'' in the warning dialog before dismissing it (which toggles '''''' to false). I did some tests for several versions including 49 and it works (at least on Windows), even though some bugs are filed for this and related issues. The preference you mentioned controls whether closing a last tab (= the only one left after closing others) closes the window and may not be what you want. Likewise, this will only work if Firefox is not set to restore tabs and windows at startup, as it would happen anyway. If the intention is to get a warning dialog when closing/exiting Firefox in general, assumingly intentional using the menu options, you need to set browser.showQuitWarning to true in about:config (not browser.warnOnQuit), which is false by default. ![]() If not, try Firefox’s Safe Mode to eliminate the chance of an add-on interfering. In short: a dialog should only appear when clicking the top right X if the Startup settings are set to Show a blank page or Show my home page. using File > Exit/Quit in the menu bar or the button in the app menu on the right, the dialog will not be displayed either. When exiting in a way that’s likely to be intentional (and in any scenario), i.e. If you only have one window and multiple tabs open, there is no use showing the warning if Firefox is set to restore tabs and windows from last time in the Startup settings, so in this case, it will only appear when a blank or custom start page is set there. If that happened, one needs to re-enable it in Options/Preferences as documented in the Startup, home page, tabs, and download settings support article - it should then be available. The option to show a warning dialog when closing multiple tabs in the Firefox options/preferences was changed to appear conditionally in order to free up space in the user interface, so it’s only available after the option itself has been unchecked in the warning dialog before dismissing it (which toggles to false). ![]() Sorry, copied the wrong option text in my previous message so edited it.
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