One of the changes in Firefox 4: '''''by default''''' Firefox 4 does not display the "Save Tabs and Exit" warning message when closing multiple tabs, but it can be turned back on by changing some preferences. *<u>Saving tabs was not removed from Firefox 4</u>, but it works a bit differently. *By default, Firefox 4 will not ask to save tabs, but instead it will always save your tabs on exit <u>unless you are in Private Browsing mode</u>. You can restore them next time by: *#clicking Firefox button > History >"Restore Previous Session", or *#type '''''about:home''''' in the URL bar and press the Enter key, then press the "Restore Previous Session" button *#See: https://support.mozilla.com/en-US/kb/Firefox%20does%20not%20ask%20to%20save%20tabs%20and%20windows%20on%20exit *''<u>Note: This was a decision by the developers. On this forum, we are all '''uncompensated volunteers''' here to help other users. The developes/employees of Mozilla/Firefox rarely, if ever visit here.</u>'' To display the "Save Tabs and Exit" message when closing multiple tabs, you can do the following: #Type '''''about:config''''' in the URL/Location/Address bar and press the Enter key #Accept the warning message (promise to be careful) #The preferences page/list will open #Filter = '''''browser.tabs.warnOnClose''''' #If its value is set to false, double-click on it (in the lower panel) to toggle its value to true #Repeat steps 4 and 5 for these following 3 preferences also: #*'''''browser.warnOnQuit''''' #*'''''browser.warnOnRestart''''' #*'''''browser.showQuitWarning''''' #**Note: last pref is new in Firefox 4b12, may need to add (boolean) #**Info/Instruction for using '''''about:config''''': http://kb.mozillazine.org/About:config #See: #*https://support.mozilla.com/en-US/questions/785169 #*http://forums.mozillazine.org/viewtopic.php?f=23&t=2105039&p=10434467&sid=fd2a35945bb2c633687f7b50d8c53989 #*http://blog.zpao.com/post/3174360617/about-that-quit-dialog Some things to check if tabs are not being saved: #'''Browsing history must be saved''' #*Firefox button: Firefox button > Options > Options > Privacy > [X] Remember my browsing history #*Menu Bar: Tools > Options > Privacy > [X] Remember my browsing history #'''Also make sure you do not clear "Browsing History" when using Clear Recent History or when closing Firefox''' #*Using Clear Recent History #**Firefox button: Firefox button > History >Clear Recent History #**Menu Bar: Tools > Clear Recent History #*When closing Firefox #**Firefox button: Firefox button > Options > Options > Privacy (checked) > Settings #**Menu Bar: Tools > Options > Privacy (checked) > Settings #**See: https://support.mozilla.com/en-US/kb/Clear%20Recent%20History #'''Make sure you are not in Private Browsing mode''' or '''in permanent Private Browsing mode''': #*See: https://support.mozilla.com/en-US/kb/Private%20Browsing #'''If you have the'''Tab Mix Plus''' extension''', then disable the built-in session restore.