When I close Firefox, my session can no longer be restored. This is frustrating because I have customized my App Tabs.

The option to "Restore Session" does not appear. I get an ooops Firefox apology with only the option to start a new session.

It is possible that there is a problem with the files sessionstore.js and sessionstore.bak in the Firefox Profile Folder.
Delete the sessionstore.js [2] file and possible sessionstore-##.js [3] files with a number and sessionstore.bak in the Firefox Profile Folder.
*Help > Troubleshooting Information > Profile Directory: Open Containing Folder
*http://kb.mozillazine.org/Profile_folder_-_Firefox
Deleting sessionstore.js will cause App Tabs and Tab Groups and open and closed (undo) tabs to get lost, so you will have to create them again (make a note or bookmark them).
See also:
*[1] http://kb.mozillazine.org/Session_Restore
*[2] http://kb.mozillazine.org/sessionstore.js
*[3] http://kb.mozillazine.org/Multiple_profile_files_created
See also:
*http://kb.mozillazine.org/Firefox_crashes
*https://support.mozilla.org/kb/Firefox+crashes

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With Firefox running, Office 2007 generates a "Cannot Empty Clipboard" error message when pasting information between Excel cells -- the behavior goes away when I close Firefox. Is there a way to prevent this?

I am running Windows XP, Office 2007, and Firefox 3.6.13.
Whenever I have Firefox running in the background and I attempt to paste information between Excel cells a "Cannot Empty Clipboard" error is generated. I have attempted numerous other fixes for this: Excel and Office settings. But nothing seems to help. When I close Firefox, the errors are no longer generated.

The Skype add-in was the culprit in my case. Disabling it fixed the problem. As soon as I enable it, the problem comes back.

My bookmarks disappear when I close Firefox. I can get them back by reloading them from a backup file but they disappear again when I restart Firefox. I've tried the "taskmanager, Process, Firefox.exe, stop process, and it doesn't work.

This occurs each time I start Firefox. The bookmarks work OK while I am using Firefox and you can add to them and save them to a HTM file. The html doesn't work for backup. When you go to organize bookmarks and try the restore function, as in "Restore Sunday October 24, 2010" you get the following error message '''''Unable to process the backup file."

Try http://kb.mozillazine.org/Locked_or_damaged_places.sqlite

When I close firefox all my tab groups close too and dissapear the next time I open firefox. I have a Mac. I try with the version 5 and 6 (beta). What can i do?

I can make the groups but the problem happens when i close firefox and open again.

Make sure that you do not use "Clear Recent History" to clear the 'Browsing History' when you close Firefox or use cleanup software that clears session data (sessionstore.js)
* https://support.mozilla.com/kb/Clear+Recent+History

Firefox is freezing. When I close Firefox, and try to re-start it, it will not open. I need to access Task Manager, where I find Firefox still running. I close Firefox in Task Manager & can re-start Firefox.

Firefox is freezing in the middle of a browsing session. When I close Firefox, and try to re-start it, it will not open. I need to access Task Manager, where I find Firefox to still be running. Once I close Firefox in Task Manager, I can re-start Firefox. This can happen several times in the space of a few hours? I'm running Vista Home premium with Firefox 3.6.16, and this problem has only started in the last 4 weeks. Can Anyone Help? Core 2 Duo E7300 with 4GB RAM.

Sounds like it is hanging when you exit and later try to restart Firefox.
* How to stop the running Firefox process
** In Task Manager, does firefox.exe show in the '''Processes''' tab?
** See: http://kb.mozillazine.org/Kill_application
**Windows 7 users: http://www.techrepublic.com/blog/window-on-windows/reap-the-benefits-of-windows-7s-task-manager/2576
* What may cause Firefox to hang at exit
**Windows 7 Task Manager: http://www.techrepublic.com/blog/window-on-windows/reap-the-benefits-of-windows-7s-task-manager/2576
** http://support.mozilla.com/en-US/kb/Firefox+hangs
** http://kb.mozillazine.org/Firefox_hangs
** https://support.mozilla.com/en-US/kb/Firefox+is+already+running+but+is+not+responding
* You may need to try Firefox Safe Mode
** You may need to use '''Safe Mode''' to locate the problem: ***See: http://kb.mozillazine.org/Safe_Mode
***Firefox 4 users, hold the Shift key while clicking the Firefox 4 desktop icon to enter Safe Mode.
***Firefox Safe Mode is a diagnostic mode that disables Extensions and some other features of Firefox.
****In Firefox 4, Safe Mode also disables Plugins and Hardware Acceleration.
****If you are using a theme, switch to the DEFAULT theme: Tools > Add-ons > Themes '''before''' starting Safe Mode (In Firefox 4, Tools > Add-ons > Appearance). See: http://support.mozilla.com/en-US/kb/Using%20themes%20with%20Firefox#w_managing-themes-and-personas
****When entering Safe Mode, do not check any items on the entry window, just click "Continue in Safe Mode".
****Test to see if the problem you are experiencing is corrected.
*** If the problem does not occur in Safe-mode then disable all of your Extensions and Plug-ins and then try to find which is causing it
***#by enabling '''one at a time''' until the problem reappears.
***#You can also enable a few at a time (3-5), keeping track of what you just re-enabled to see if the problem re-occurs; this will help narrow down the possibilities if you have a large number of add-ons.
***#'''You MUST close and restart Firefox after EACH change''' via File > Restart Firefox (on Mac: Firefox > Quit).
***#You can use "Disable all add-ons" on the Safe Mode start window.
**See the following for more information
*** http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes
*** http://support.mozilla.com/en-US/kb/Troubleshooting+plugins
*** http://support.mozilla.com/en-US/kb/Basic+Troubleshooting
 
 
'''You need to update the following:'''
*Adobe Shockwave for Director Netscape plug-in, version 11.0
*Shockwave Flash 10.2 r152
#'''''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 Shockwave for Director'''
#*NOTE: this is not the same as Shockwave Flash; this installs the Shockwave Player.
#*Use Firefox to download and SAVE the installer to your hard drive from the link in the article below (Desktop is a good place so you can find it).
#*When the download is complete, exit Firefox (File > Exit)
#*locate and double-click in the installer you just downloaded, let the install complete.
#*Restart Firefox and check your plugins again.
#*'''Download link and more information''': http://support.mozilla.com/en-US/kb/Using+the+Shockwave+plugin+with+Firefox
#'''Update the [[Managing the Flash plugin|Flash]] plugin''' to the latest version.
#*Download and SAVE to your Desktop so you can find the installer later
#*If you do not have the current version, click on the "Player Download Center" link on the "'''Download and information'''" or "'''Download Manual installers'''" below
#*After download is complete, exit Firefox
#*Click on the installer you just downloaded and install
#**Windows 7 and Vista: may need to right-click the installer and choose "Run as Administrator"
#*Start Firefox and check your version again or test the installation by going back to the download link below
#*'''Download and information''': http://www.adobe.com/software/flash/about/
#**Use Firefox to go to the above site to update the Firefox plugin (will also install plugin for most other browsers; except IE)
#**Use IE to go to the above site to update the IE ActiveX
#*'''Download Manual installers'''.
#**http://kb2.adobe.com/cps/191/tn_19166.html#main_ManualInstaller
#**Note separate links for:
#***Plugin for Firefox and most other browsers
#***ActiveX for IE

Where can i find the option of, when i close firefox that he saves my current tabs and when i open my firefox i will still have them?

Where can i find the option of, when i close firefox that he saves my current tabs and when i open my firefox i will still have them?

Firefox 4 and later versions save the previous session automatically, so there is no longer need for the dialog asking if you want to save the current session. 
Use "File > Exit" or "Firefox > Exit" (Mac: "Firefox > Quit Firefox") if you want to restore multiple windows or otherwise have problems with restoring tabs. 
You can use "History > Restore Previous Session" to get the previous session at any time. 
You may need to click the orange/gray Firefox button to see History. 
There is also a "Restore Previous Session" button on the default about:home Home page.
Using the "Show my windows and tabs from last time" setting is a more reliable way to restore session data.
* Tools > Options > General > Startup: "When Firefox Starts": "Show my windows and tabs from last time"
* http://kb.mozillazine.org/Menu_differences
Make sure that you do not use "Clear Recent History" to clear the 'Browsing History' when you close Firefox.
* https://support.mozilla.org/kb/Clear+Recent+History

When I close firefox "everything " is cleared! EXCEPT when I open it again and anything i have copied to the clipboard (paste icon) remains lit... I believe this can be a security breach because I clear everything when closing firefox !!

I have my settings to clear everything when I close firefox ver 3.6.13. If I copy something to the clipboard, the Paste icon lights up so I can paste the text... which is normal.
The problem is when I close the browser and everything is suppose to clear (history, etc) the PASTE Icon still lights up for me to paste again.
This can be a security breach because I want everything cleared when closing the browser !!!
The only way I can rid myself of this problem is to restart the computer... which clears the clipboard of the operatinging... which is absolutely normal as well.
I should not have to restart the computer each time.
Try It !!! type text in any box... then paste it by using the PASTE Icon
CLEAR all your history, everything ... then close firefox
Reopen the browser... and the PASTE Icon will light up

I only had a few addons installed, I disabled Zone Alarm toolbar, View Source Chart 3.01. I also had 5 separate java console updates/addons, and I uninstalled all but the latest java console 6.0.21. All I have now is Roboform 6.9.98, Firebug 1.5.4, Java console 6.0.21, Java quick starter 1.0. So far, so good, the problem has not occurred today. I hope this is it, I will be more sure after a few days problem free. Thanks for the info.

When I close firefox it doesn't really close it seems to be hidden. Then when I try to start it again I have to Alt, Ctrl, Del, go to process , turn it off then hit it to start again. I can not get it to open in the hidden process that it is in

Apparently when I close Firefox it doesn't really close. I get told when I try to open Firefox later "Firefox is still open, you must close Firefox, Then reopen it. Then I hit Alt, Ctrl & Del, go to process's then I have to close it then reopen it. It does not open until it is closed in process's.

The process can take a few seconds to close. Sometimes you need to use Task Manager.

I choose to save and quit when I close Firefox, but recently my pages dissapear on new session for few times. Is the new version unstable?

I choose to 'save and quit' when I close Firefox, but recently my pages disappear on new session for few times. After I reopen firefox, it's only my default homepage left, all my other pages that I previously save before closing firefox are all gone. It has happened for a few times with this new version, which I do not have this kind of problem before with other version. I wonder is this version unstable? Or is there any other way to deal with it? Thanks!

You should update to Firefox 3.6.13. See Help > Check for Updates.
If you use [[Clear Recent History]] to clear the 'Browsing History' when you close Firefox then restoring tabs from the last session ("Save & Quit" or "Show my windows and tabs from last time") doesn't work.
* http://kb.mozillazine.org/Session_Restore

When i close firefox it keeps running in the background and i have to got in taskmaster to close it so i can open it again

when i close Firefox it keeps running in the background and i have to got in taskmaster to close it so i can open it again I am running windows 7 64 bit

Firefox Hang at Exit
https://support.mozilla.com/en-US/kb/Firefox%20hangs#w_hang-at-exit
See the Bulleted points in this section
Check and tell if its working.

When I close Firefox, the windows closes normally, but firefox.exe still appears in Processes in Task Manager. I have to End Process to open Firefox again, and it goes to Restore Last Session page.

When I close Firefox, the windows closes normally, but firefox.exe still appears in Processes in Task Manager. I have to End Process to open Firefox again, and it goes to Restore Last Session page.
Quando eu fecho o Firefox, a janela fecha normalmente, mas o firefox.exe ainda aparece no Processos do Gerenciador de Tarefas. Eu tenho que Finalizar Tarefa pra abrir o Firefox de novo, e quando abre vai para a página de Restaurar Última Sessão.

I have the same problem - every time I close firefox (using either the red x or by selecting file ---> exit) the program appears to close normally, but the firefox.exe *32 process continues to run. If I try to re-open firefox normally I get a message that the program is still running and I need to go into task manager and manually kill the process.
I could also kill the process from the command prompt, but both of those methods are slow and annoying. This issue has only been occurring for the last 24 hours or so; to the best of my knowledge I haven't downloaded any new software or updated any plug-ins that would have caused a switch from firefox's normal awesomeness. Norton doesn't show any new viruses or other nastiness on my computer.
I'm running 64 bit Windows 7 Home Premium edition.

When I create app tabs they appear as they should. When I close firefox and open it it fresh all the app tabs are gone. How can I pin them sothey do not disappear when I close firefox?

see question

Make sure that you do not use Clear Recent History to clear the Browsing History when you close Firefox.
* https://support.mozilla.com/kb/Firefox+does+not+ask+to+save+tabs+and+windows+on+exit
* https://support.mozilla.com/kb/Clear+Recent+History

Sometimes when I close Firefox and try to open it in few moments it shows me message "Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system." However, I haven't o

Sometimes when I close Firefox and try to open it in few moments it shows me message "Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system." However, I haven't opened any additional Firefox related programs, and previous Firefox is closed. First I though it is because of my computer, but then I discovered that other people have the same problem as well
== This happened ==
A few times a week
== some 2 month ago ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.5.30729; InfoPath.2; .NET CLR 3.0.30729)

Hi Andis.
First of all, this is completely normal behavior, although it's a bit irritating, I know. What happens is that when you close Firefox, despite the window disappearing right there and then, Firefox keeps running for a little bit until the whole closing procedure is completed. This can take a fraction of a second on fast computers, or can take a few seconds on slow computers or when Firefox is storing a large session (if you save your tabs). All you have to do is wait a bit until Firefox closes, and then open it again.
To see if it's still running, you can press CTRL+SHIFT+ESC and then, under the Processes tab, you can see if firefox.exe is still there. If it's taking an unusual amount of time to close (which happens very rarely, and only if the browser freezes on exit), you can force the application to terminate from this application (task manager).
Firefox 4.0 will reduce by 97% the time it takes firefox.exe to close, so this problem will be basically erased for Firefox's next version.
Until then, I can recommend you this extension, which helps you restart your browser more easily and without bothering about closing times:
https://addons.mozilla.org/en-US/firefox/addon/3559/
Hopefully this will help.

When I close Firefox then wont reopen unless I go to task Manager and close program from there.

When I close Firefox it will not open another window when you click on icons or manually try to open new window. I have to open Task Manager find Firefox program and manually close program. Then when you open a new Firefox window it try's to restore previous session , saying sorry Firefox crashed. I have uninstalled and reinstalled , turned off all add-on's nothing has worked. No virus's , no other outside influences , nothing else on my computer has issues. Can you help?

See this: 
https://support.mozilla.com/en-US/kb/Firefox%20hangs#w_hang-at-exit

I copied this from your 5.0 download information: "All of the App Tabs you have set when you close Firefox will open as App Tabs when you start Firefox again." When I opened my computer today all my apptabs from yesterday had disappeared. Why?

Your download page for 5.0 stated: All of the App Tabs you have set when you close Firefox will open as App Tabs when you start Firefox again.
I liked the convenience of using App Tabs and was disappointed to find that the ones I had set up yesterday were gone today. Am I doing something wrong?

Works fine for me, I can simulate your problem by improperly closing Firefox.
The correct way would be to close the windows you don't want and then to exit Firefox through the File ("'''Alt+F'''") menu then use '''Exit''' or '''Qui'''t depending on your system.
But '''I can simulate your problem''' by closing the good window with "X" in the upper right-corner first (the one with the app-tabs) and then close the other window by any means.
You restart Firefox and open a window, since you closed without app-tabs there are none so you just see a window with your home page.
Firefox has some things added to Firefox 4 and therefore in Firefox 5.
# "'''Alt+S'''" (Hi'''s'''tory menu)
# "'''Restore Previous Session'''" (that's the window without the app-tabs, but you have to this first)
# "'''Restore Recently Closed Windows'''" -- can choose which window to reopen based on name and the mouse-over tells how many tabs. or you just use "'''Restore All Windows'''" without the guessing.
''I know you are on a Mac, and this affects Windows user more than anybody else, but it does affect other systems besides Windows, occasionally, perhaps more often now with the plugins container.''
The following may not completely eliminate having to terminate Firefox through the Windows Control Panel but it will come very close.
'''Plug-in and tasks started by Firefox may continue after attempting
to close Firefox''' The "X" in the upper right-hand corner closes the
Window (same as Ctrl+Shift+W) but even if it is the last Firefox window,
it does not necessarily close Firefox .
The only '''proper way to exit Firefox''' is to use '''Exit''' through the
File menu, not the "X" in the upper right corner of last Firefox window.
In the Firefox 4 and 5 that would be Alt+F then X
* '''Firefox hangs''' | Troubleshooting | Firefox Support http://support.mozilla.com/en-US/kb/Firefox%20hangs#w_hang-at-exit
Use the '''Windows Task Manger''' to remove all running firefox.exe in the "'''Processes'''" tab of the Windows Task Manager, then restart Firefox.
If Firefox will still not start, remove the parent.lock file from the profile which is created each time Firefox is started to prevent other Firefox tasks from running, see 
http://kb.mozillazine.org/Profile_in_use#Remove_the_profile_lock_file
'''Avoiding Problems with close/restart''' ''choose either extension''
:Use to close and restart Firefox after enabling or disabling an extension, switching to a new theme, or modifying configuration files, then you don't have to worry about delay or have to look in the Task Manager to see if Firefox is closed yet.
Both extensions use the same keyboard shortcut "'''Ctrl+Alt+R'''" or a file menu option.
*"'''Restartless Restart'''" extension for Firefox 4.0+ only (2 KB download ) https://addons.mozilla.org/firefox/addon/249342/
*For older versions use "'''QuickRestart'''" extension (34 KB download) ( https://addons.mozilla.org/firefox/addon/3559/

When I close Firefox, my session can no longer be restored. This is frustrating because I have customized my App Tabs.

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