Clicking on the tabist icon in the toolbar will open up a new tab with a list of all your Windows and Tabs. Clicking on any of those links will bring that window and tab into the foreground. Command-Shift-E or Control-Shift-E will bring up the Tabist page for easy use.
Have a bug or feature request? Fill out an issue over here: https://github.com/fiveNinePlusR/tabist
Patches welcome as well.