Open previous windows and tabs
There are times that when I open firefox that some of my tabs that does this weird thing where my tabs from the previous session that I left doesn't load up, from what I see is a blank tab that doesn't access the sites I left. It's been twice since I encountered this and I can't replicate the issue. When it happens I try checking out the recently closed tabs or window it doesn't show the ones that didn't show up.
Ausgewählte Lösung
Here's the answer to the question I was able to fixed it after reading a few things.
Make sure that when you do this your firefox is closed.
type this to a blank tab about:support
find Profile Folder, it will open a windows explorer leading you to something like this: C:\Users\(your pc name)\AppData\Roaming\Mozilla\Firefox\Profiles\eklf8yiy.default-release(this may vary)
look for sessionstore-backups, then rename it as sessionstore-backupsOLD
then open the sessionstore-backupsOLD folder
then there is a file something like upgrade.jsonlz4-20250806102122 (the numbers at the end may vary) if you have multiple files make sure to test out each file.
now go back one folder back [C:\Users\(your pc name)\AppData\Roaming\Mozilla\Firefox\Profiles]
From the profiles folder look for sessionstore.jsonlz4 rename it as sessionstoreOLD.jsonlz4
then copy the upgrade.jsonlz4-20250806102122 from the sessionstore-backupsOLD to [C:\Users\(your pc name)\AppData\Roaming\Mozilla\Firefox\Profiles] and rename it to sessionstore.jsonlz4
after that you can test out the other upgrade.jsonlz4-xxxx files that you may have from the renamed folder sessionstore-backupsOLD
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I've asked a similar question years ago regarding previous instance opening in a different virtual desktop with no joy. I simply close the window and launch a new Firefox instance on my working desktop. If I want to go back to a previous site, History presents itself.
Ausgewählte Lösung
Here's the answer to the question I was able to fixed it after reading a few things.
Make sure that when you do this your firefox is closed.
type this to a blank tab about:support
find Profile Folder, it will open a windows explorer leading you to something like this: C:\Users\(your pc name)\AppData\Roaming\Mozilla\Firefox\Profiles\eklf8yiy.default-release(this may vary)
look for sessionstore-backups, then rename it as sessionstore-backupsOLD
then open the sessionstore-backupsOLD folder
then there is a file something like upgrade.jsonlz4-20250806102122 (the numbers at the end may vary) if you have multiple files make sure to test out each file.
now go back one folder back [C:\Users\(your pc name)\AppData\Roaming\Mozilla\Firefox\Profiles]
From the profiles folder look for sessionstore.jsonlz4 rename it as sessionstoreOLD.jsonlz4
then copy the upgrade.jsonlz4-20250806102122 from the sessionstore-backupsOLD to [C:\Users\(your pc name)\AppData\Roaming\Mozilla\Firefox\Profiles] and rename it to sessionstore.jsonlz4
after that you can test out the other upgrade.jsonlz4-xxxx files that you may have from the renamed folder sessionstore-backupsOLD
I closed this as I resolved my own issue. Just refer to the reply I made