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You can enable saving the tabs when closing Firefox.
It is on and has been for years but I still lose all my tabs regularly.
Is it because of Sync? Container Tabs? I don’t know
If I’m not too mad next time, I will try to find out why I lose them but my instinct is to reopen right away the tabs that I need the most.
Wow C, CSS and JS files at the same level. You don’t see this every day