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Chrome also uses a private window, not private tabs. You just can't restore closed private tabs, which is probably how it should be.

The thing is that chrome sandboxes every tab, but firefox doesn't and it's easier for firefox to restore tabs than for chrome is to do.

Chrome fires up a separate thread for each tab. So any information about that tab is lost once the tab, (and thus sandbox) closes. No information specific to the tabs is stored in the window unless explicitly done (like bookmarking). Thus, the session history is stored inside that sandbox, so it's gone once it's closed.

Firefox is maintaining a window with tabs within it. So it can still keep your session info for each tab stored at the window level and restore it even after a tab is close.

> In Firefox you create a private window, not a private tab.

This isn't true either. Log in to a site in one private window and then open another one. You'll be logged in in that one too.

I was talking about how tabs is handled in private window.