How to get back the option Save and Quit on Firefox 40.0.3?

I've made adjustments on the "subject: config ' once before on the activation of the feature, but a few minutes ago, I got the check box for the option"Do not ask next time"checked by accident and then click on the 'Save & exit' button back. Now, everything just closes and automatically save my tabs active! How do I get the warning message box to invite again so I can choose to save and exit, flee or just cancel?

If you use "show my windows and tabs from last time", as the start setting then you won't get from this dialog box.

You can check the startup parameter:

  • Tools > Options > general > startup: "startup of Firefox:
    "Show my windows and tabs from last time '.
    "Show my home page".
    'Display a blank page '.

Tags: Firefox

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