Even after enabling "Warn me when closing multiple tabs", firefox closes without any warning even if multiple tabs are open.

I recently installed Firefox 4.0 and in the options, under the section "Tabs", I have enabled "Warn me when closing multiple tabs". But if I have multiple tabs opened with websites loaded in them, and then try to close the browser, it simply closes. No warnings are shown (which was there in previous versions). Couple of times I clicked on the close button of browser and then realized that I had some important sites opened in different tabs, which I lost as it didn't warn me. Can you please let me know whether this is a bug or a mistake from my side?

I'm sure you are using Private Browsing mode in Firefox 4. I have also the same problem and I tried to uncheck this option after many times accessing about:config\browser.warnOnquit. And it's wonderful, the warning cameback. I think it's a bug about Private Browsing mode. Hope Mozilla's Developers will fix it.

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