I use Xubuntu on my media server, and have never had that happen. I get a notification saying that the Firefox snap is going to update in 14 days, but closing the browser, updating, and reopening brings all my tabs and windows back. I get the same if I close the browser and restart the computer, letting the snaps update automatically.
I wonder if OP has got the restore open tabs setting turned off.
I use Xubuntu on my media server, and have never had that happen. I get a notification saying that the Firefox snap is going to update in 14 days, but closing the browser, updating, and reopening brings all my tabs and windows back. I get the same if I close the browser and restart the computer, letting the snaps update automatically.
I wonder if OP has got the restore open tabs setting turned off.