swap to most recent tab
95% of the time I want switch to the previous tab I was on--not the next or previous tab in order across the top of the editing pane. Perhaps have a setting or a keyboard command (swap-tab?) that allows me to switch to the most recent tab. To be explicit let's say I'm on tab A. The swap-tab command would switch to tab B. If I execute the command again it would take me back to tab A. Note, however, that this just doesn't track the last two tabs. If I'm on tab A and close tab B the most recent tab changes to a different tab. It's a stack where the command would swap between the top two elements on the stack.
I have a Chrome extension for this in Chrome and love it. I'd like similar behavior in Mongobooster.