Solved: Firefox closes without warning message

I've been using Mozilla Firefox since many years I don't really notice since when my FF had become rude and start closing without any warning doesn't matter how many tabs you've opened. That was irritating at times when you hit close button by mistake.

I found a really great new thing about Firefox which is there configuration that can be seen by typing about:config in address location bar. You can configure a hell of things here.

Solution:

1. Type about:config into the location bar and press enter
2. Accept the warning message that appears, you will be taken to a list of preferences
3. Locate the preference browser.tabs.warnOnClose, if its value is set to false, double-click on it to change its value to true
4. Repeat this for these 3 preferences browser.warnOnQuit, browser.warnOnRestart and browser.showQuitWarning"

That's it. This will show a warning message whenever you'll quit firefox.

FEEL SAFE N ENJOY BROWSING :)