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 *''<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>'' Some things to check: #'''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. 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 <br /> -------------------------- <br /> '''You need to update the following.''' The Plugin version(s) shown below was/were submitted with your question and is/are out of date. You should update to avoid known security issues with the version(s) you have installed. Click on "More system info..." to the right of your question to see what was included with your question. *Adobe PDF Plug-In For Firefox and Netscape 8.2.5 #'''''Check your plugin versions''''' on either of the following links': #*http://www.mozilla.com/en-US/plugincheck/ #*https://www-trunk.stage.mozilla.com/en-US/plugincheck/ #*'''Note: plugin check page does not have information on all plugin versions''' #*There are plugin specific testing links available from this page: #**http://kb.mozillazine.org/Testing_plugins #'''Update Adobe Reader (PDF plugin):''' #*From within your existing Adobe Reader ('''<u>if you have it already installed</u>'''): #**Open the Adobe Reader program from your Programs list #**Click Help > Check for Updates #**Follow the prompts for updating #**If this method works for you, skip the "Download complete installer" section below and proceed to "After the installation" below #*Download complete installer ('''if you do <u>NOT</u> have Adobe Reader installed'''): #**SAVE the installer to your hard drive (save to your Desktop so that you can find it after the download). Exit/Close Firefox. Run the installer you just downloaded. #**Use either of the links below: #***https://support.mozilla.com/en-US/kb/Using+the+Adobe+Reader+plugin+with+Firefox ''(click on "Installing and updating Adobe Reader")'' #***''<u>Also see Download link</u>''': http://get.adobe.com/reader/otherversions/ #*After the installation, start Firefox and check your version again.

Firefox 4 saves the previous session automatically, so there is no longer need for the dialog asking if you want to save the current session.<br /> You can use "Firefox > History > Restore Previous Session" to get the previous session.<br /> There is also a "Restore Previous Session" button on the default <b>about:home</b> Home page.<br /> Another possibility is to use: * [http://kb.mozillazine.org/Menu_differences Firefox (Tools) > Options] > General > Startup: "When Firefox Starts": "Show my windows and tabs from last time"

Thanks for a nice simple solution

You're welcome