In that case it would have helped if you had formulated your answer more precisely.
I don't know which video you're talking about, but in case it was a youtube video, you might want to try looking at the youtube history of your account (if you have one that is)
Btw, refreshing doesn't delete your history. Unless you specifically deleted your history, it should still be there. (Except if you set it to.delete everything upon closing ff, but I don't think you did)