If you open FF and closed without restoring the previous session they are gone. I know this because I done with and without checking the boxes in History settings. So if you didn't do a Restore Previous sessions in the FF History tabs option then they are gone and you will have to find them in the history and open one at a time to get them back. This is assuming your settings doesn't delete the history when you close FF.

You can try to check if there is a previous version of sessionstore.jsonlz4 available as part of a Windows system restore point.

Do not use System Restore, but use this utility.

• System Restore Explorer: http://nicbedford.co.uk/software/systemrestoreexplorer/

See also:

• https://www.jeffersonscher.com/res/scrounger.html

Windows 10. FF 59. I failed to click on session restore after a crash and lost the tabs. I could not find the sessionrestore file.

And the Recently Closed Tabs and Windows options were greyed out.

I thought that the tabs are synced. Are they not recoverable?

Regarding cor-el's suggestions: 1) That refers to a full system restore. Is that not OTT? Plus I discovered that although "system protection" was turned on there was no restore point, so could not go back a day.

2) I don't understand the "scrounger" thingy.

Many of the tabs were in place for months or more, so going through history looking for them one by one would be a huge job.

Any chance of restoring my (dozens of) tabs?

No, if you use a utility to browse restore points then then can choose ot only restore one or more specific files.

Like I posted above, you can look at an utility to browse System Restore points.

• http://nicbedford.co.uk/software/systemrestoreexplorer/
• http://www.shadowexplorer.com/