This one comes from Christine Smith, one of Zayo’s amazing Client Service Managers. Thanks for the tip!
Passing on a new trick I learned from my 14 year old – did you ever close out a page/tab by mistake? If you press the “Ctrl” “Shift” and the “T” keys it will open them back up. I had a bunch of sf.com pages open and inadvertently closed them all, after I did this, they all reopened.