Make a button on the top-left side of the toolbar. The button will have a lock/unlock icon.
When pressed: If it's locked, request for touchID/password. If it's unlock, hide the tabs.
In the tab bar, maybe change the color of the tab title to indicate that it's a hidden tab
When the user right clicks on a tab, make an option to set as hidden. Or add a keyboard shortcut.
How it works: The tab will be hidden from the tab bar but the webview will still be active.
Also: Once the user is not currently using Orion, make sure the tabs automatically hide.
