You might see it as similar, but it's not at all the same thing. I want to be able to tab among open files in most-recently-visible order; the BrowseTracker plugin, as I understand it, keeps a full history, so if I switch back and forth between 2 tabs several times, I'll then have to hit the shortcut keys many more times in order to get to a tab I haven't activated in a while.
BrowseTracker does, I believe, exactly as you ask. It only keeps track of "activated" editors and keeps the previously activated as the next to be activated on the next use of the Alt-LeftArrow key.
It ignores any editors that have never been activated.
It activates editors in an order that reflects the order in which they have recently been activated.
So if you want the previous to previous editor activated, just hit the Alt-LeftArrow two times.
Currently it is being fixed, since wxAuiNotebook has a different interface to the NavigationKey.