Showing/hiding e.g. the status bar through View -> Status Bar doesn't correctly set window.statusbar.visible. If we used the correct BarProp to start with, these two couldn't get out of sync and would even be easier to track and restore by Session Restore. The available BarProps are: menubar, toolbar, personalbar, locationbar, statusbar. The main problem would probably be persisting the BarProp values. Bonus points for correctly setting the address bar to read-only mode when it'd be hidden (usually through toolbar.visible = false).
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