Bugzilla

> You are telling me that if you open two firefox browser windows(same app) an load some tabs in each one and then kill one then close the other that you can open all tabs from both windows using "Restore previous session"?

Yes, both windows can be restored when using the option *History* > *Restore previous session*.
I didn't manage to reproduce the issue described in Comment 6 using Firefox 106.0 or Firefox 106.0.5 .

These are the steps I've followed when trying to reproduce your issue:
-open two Firefox windows
- in each window open several tabs
-close one window
At this point the previous closed window can be restored from the side menu using the option *History* >*Recently closed windows*

-close both windows
-open a new Firefox instance
At this point both windows can be restored from the side menu using the option *History* >*Restore previous session*

Please detail and include here any other steps that might help to investigate this further.

> You are telling me that if you open two firefox browser windows(same app) an load some tabs in each one and then kill one then close the other that you can open all tabs from both windows using "Restore previous session"?

Yes, both windows can be restored when using the option *History* > *Restore previous session*.
I didn't manage to reproduce the issue described in Comment 6 using Firefox 106.0 or Firefox 106.0.5 .

These are the steps I've followed when trying to reproduce your issue:
-open two Firefox windows
-in each window open several tabs
-close one window
At this point the previous closed window can be restored from the side menu using the option *History* >*Recently closed windows*

-close both windows
-open a new Firefox instance
At this point both windows can be restored from the side menu using the option *History* >*Restore previous session*

Please detail and include here any other steps that might help to investigate this further.