You can restore a closed window -- don't know about 60 tabs removed from a window. Use "Alt" to bring up the Menu bar (if hidden), then click on History, then Restore windows then select windows to restore and / or tabs to restore.

You can bookmark all of the open tabs by right click on a tab then "Bookmark all tabs" will be grayed out if only one tab, and in FF 6.0 does bookmark the app-tabs. App-tabs should already be bookmarked by you anyway so they can can be restored.

If you fail to bring back the tabs, use the History Sidebar ("Ctrl+H"), they are not in the history on the basis of last open though so if they've been open for several days you may have a hard time finding what was lost. The "View" single menu item at the top of the History sidebar allows for various ordering, but you may wish to the the History Library List instead ("Ctrl+Shift+H").

reference

• Viewing the browsing history - Firefox - MozillaZine Knowledge Base
  http://kb.mozillazine.org/Viewing_the_browsing_history_-_Firefox
• Bookmark or save multiple tabs - MozillaZine Knowledge Base
  http://kb.mozillazine.org/Bookmark_or_save_multiple_tabs

session:

• http://kb.mozillazine.org/Browser.sessionstore.max_tabs_undo (default is 10)
• http://kb.mozillazine.org/Browser.sessionstore.max_windows_undo (default is 3)
• http://kb.mozillazine.org/Session_Restore

Thanks for your response! However... When you shut down windows without closing FF, the urls are all saved somewhere, because when you start windows again and open FF, you can restore all the FireFox windows and tabs. All the tabs were open this morning (but not accessed for a few months so nothing in "history"). I closed a few windows and got a message "Close all tabs?". I clicked "ok" - to my detriment. If I know the file where these links were stored, I can "undelete" or restore it to yesterday's version and it will be 'OK'. Can anyone tell me where the details are kept? Is it in the registry or a file in "application data" or somewhere else?

Any help will be greatly appreciated!

In the address bar, type 'about:cache'

You will see Disk Cache Device. Copy the url there and enter it into a fresh FF tab. Firefox will open the address on your computer and there will be all the downloaded pages that populated all your tabs. You should also be able to copy/paste the url into Windows Explorer and it will go to the same place.

The Cache is a hidden file, so you made need to reveal Hidden Files in Windows folder preferences for Explorer to find your Firefox files.

If this was the answer you were looking for, please click 'Solved' - Thanks.

That data is stored in sessionstore.js in the Firefox Profile Folder

• http://kb.mozillazine.org/Profile_folder_-_Firefox

• http://kb.mozillazine.org/sessionstore.js
• http://kb.mozillazine.org/Session_Restore

Thanks for all your help guys! However, see the pic attached. Whatis the filename where the sessionstore data is written to? That is what I need to get hold of to try and restore/revert/unerase to the previous version to get the lost data. Firefox only saves the last window/session data. I physically closed the tabs so Firefox did not store them at this instance but it was stored because Firefox restored them originally.

1.If the filename is sessionstore.bak or sessionstore.js, do you know of a way to revert to a previous version? 2.I noticed a sessionstore-1.js, sessionstore-2.js .......up to 7. What is that for? Hope I don't cause more confusion.

Thanks in advance for your replies!

BTW, the person that can seriously help me sort this mess earns himself the INTERNATIONAL FIREFOX GURU award!!

The presence of numbered sessionstore-##.js means that at the time that they were created Firefox wasn't able to rename such a numbered temp file to sessionstore.js and left that temp file with the number in the name.
Firefox first creates such a numbered temp file to prevent dataloss in case of problems.
The file sessionstore.bak is created at the start of a session as a copy of sessionstore.js to make it possible to reopen the previous session.

You can check the file dates of the numbered sessionstore-##.js files to see if they are recent and in that case you might be lucky and renaming one of them to sessionstore.js could recover the session that is stored in the file.

You can also try a file recovery program like Recuva to see if that can bring back older copies of sessionstore.js.

• http://www.piriform.com/recuva

Thanks cor-el, looks like you're over halfway to becoming recognised as the INTERNATIONAL FIREFOX GURU! One more step to go. I found the missing stuff in the numbered --.js files!! Thanks for that. Possibly the last question: How do I get Firefox to restore the file? Renaming the --.js alone does not seem to trigger a restore. I guess I need to create a dummy "shutdown" of Firefox, so it will prompt for a restore on the startup. Can I do that by changing a parameter in about:sessionstore or about:sessionrestore?

Thanks for your help!

How do I get Firefox to restore the file? Renaming the --.js alone does not seem to trigger a restore.

Bring up your profile in windows as you had before, then close Firefox, make sure Firefox is down by checking the "Processes" tab in the Windows Task Manager, then do your rename and bring Firefox back up.

When Firefox is back up or maybe that's what you've done already and simply need to go the History menu ("Alt+H") and then "Restore last session".

You might want to backup your profile or at least those sessions files.

{duplicate suggestion deleted}

It worked!! Thanks a lot to everyone that contributed. The INTERNATIONAL FIREFOX GURU status is awarded to cor-el and dmcritchie for the most appropriate answers that got me out of this mess! Unfortunately there is no option to split the chosen answer on this forum - pity. Thanks again and may you be blessed by YHWH, creator of the Universe, for your goodwill!

Cheers