UPDATE: This is actually only working if I am not using multiple displays. I have a 3 monitor setup in my home office and when I have my macbook connected to them and activate rewind it doesnt allow me to select the screens. However, If I am not connected to the additional displays then I am able to select and restore the chrome tabs.
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Clicking on a browser window is supposed to open up and restore that session while in rewind -- according to the website and intro videos. This feature is not working for me.