For some unknown reasons, Mozilla has removed "Save and Quit" feature from Firefox 4.0 and later versions. In earlier versions, if you opened more than one tabs in Firefox and clicked on Close button, it used to show a dialog box to save your tabs and quit the window.

In Firefox 4.0 and later versions, it no longer allows you to save the tabs. Whenever you click on Close button, it only warns you with a dialog box but doesn't provide any button to save the tabs.

Using this small trick, you can bring back the good old feature in Mozilla Firefox 4.0 and later versions:
1. Open Firefox and type about:config in the addressbar and press Enter. It’ll confirm, click on I’ll be careful, I promise! button.

2. Now type quitwarning in the Filter box, it'll show following boolean key:
browser.showQuitWarning
3. The entry "browser.showQuitWarning" would be set to false. Double-click on it or right-click on it and select toggle. It'll set its value to true.
4. Now whenever you close multiple tabs, Firefox will ask you to save the tabs and quit.
This article was posted by VG in following section: Mozilla Firefox.
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Jeet Chowdhury
thanks for this post. its really useful for me.... :) btw ff4 rocks.... best browser i have ever used.... :)
Mushaf
Thanks a lot. I was missing this 'Save and Quit' feature a lot. Had to go through History → Restore Previous Session for a while. But now its easy and simple again.
Uewd
One of the features I miss. Thanks a lot.
3abboud
Haha ! You are the best VG !!! Thank you :)
Dnyanesh Mankar
I've tried this hack before but for some reasons I still don't get the "Save Tabs" warning.
ebony
browser.warnOnQuit;true
Mine is set as above and it does not ask me to save tabs and quit. It did at one time. That is why I hate auto updates. :(
Ravi
Go to Firefox - Options - General - When Firefox starts - choose 'Show my home page'. If it is set to 'Show my tabs and windows from last time', you will not get any warning when closing multiple tabs.
Robert
Thank you! That fixed it for me.
Katy
Thanks. This was great help! I was starting to think I was going to have to downgrade back to the older version because I couldn't live without the 'save tabs' feature. You saved the day!
tom
I went thru the steps, it is set to TRUE, but i do not get the SAVE AND QUIT option, only the “sure you want to close multiple tabs” warning.
Hmmm