changes the Ctrl+Shift+T keyboard shortcut to reopen the last closed tab or last closed window in the order they were closed or restore the previous session if there aren’t any tabs or windows to reopen.
Amusing that Firefox gets worse to match Chrome here. Oh well.
Previously, ctrl-shift-T only reopened tabs and worked per-window. I think it's much more intuitive that way, since it's cleanly separated from other features (ctrl-shift-N) and works kind of like ctrl-T.