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I can't reestablish the warning for when I try to close multiple tabs

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I accidentaly clicked the "Don't warn me again message" of the warning I get when I (cmd +d) close Firefox, and I can't find anywhere how to reestablish that warning, I really need this; I use Mac and Firefox 3.6.3

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Firefox -> Preferences, "Tabs" section, tick "Warn me when closing multiple tabs"

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You can reset the warn prefs on the about:config page via the right-click context menu. browser.tabs.warnOnClose , see browser.warnOnQuit , see browser.warnOnRestart , see

To open the about:config page, type about:config in the location (address) bar and press the Enter key, just like you type the url of a website to open a website. If you see a warning then you can confirm that you want to access that page.