Just lost hundreds of open tabs related to a months long project (this has been a problem for everyone)
It only backs up the tabs from your last close, so if you had a problem and closed twice, all your tabs are gone. There are many many easy ways to change it so this can never happen to people anymore. Why has this not been fixed after all this time? I am a retired IT pro and this has even happened to me. It is horrible. What can users do to not have this happen, since the developers apparently can't be bothered? And please don't tell me not to keep so many tabs open JUST because the browser sucks at protecting them. Any good news appreciated. Thanks.
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Yeah it happens. If there is nothing under history in the menu you can restore them manually. Close Firefox when you're ready to make file name changes. In the sessionstore-backup folder in your profile folder. Find the largest file before the issue happened. Change it to sessionstore.jsonlz4. Move it to the profile folder replacing the current file and then open Firefox. It should restore the session from that time period.
The backup file was tiny and useless. The browser should auto-maintain a collection of previous backups going back like 6 months or something. Then this would not be such a horrible problem.
Don't you have a upgrade.jsonlz4 in the sessionstore-backups folder?
You can check this article.