I have lost my last window of 61 tabs. Recently Closed Windows is greyed out. How do I restore my window?

RECENTLY CLOSED TABS doesn't offer what I need. And RECENTLY CLOSED WINDOWS is greyed out. Can't I roll back my Firefox to 2 days ago and recover my missing window with 61 tabs?

Your System Details list shows that you have a user.js file in the profile folder to initialize prefs each time Firefox starts.
The user.js file is only present if you or other software has created this file and normally it wouldn't be there.
You can check its content with a plain text editor (right-click: Open with) if you didn't create this file yourself.
The user.js file is read each time Firefox is started and initializes preferences to the value specified in this file, so preferences set via user.js can only be changed temporarily for the current session.
Your System Details list shows that you have preferences that were used in previous Firefox versions and that are no longer supported in the current Firefox release.
You can cleanup the prefs to have a fresh start and delete possible user.js and numbered prefs-##.js files and rename (or delete) the prefs.js file to reset all prefs to the default value including prefs set via user.js and prefs that are no longer supported in the current Firefox release.
You can use this button to go to the currently used Firefox profile folder:
*Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Preferences_not_saved

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