After Mercari's last update, it will no longer be able to run in the background exclusively for the PrimeLister Mercari platform. This means that you will only be able to do the Relist and Duplicate features if you have chrome open in front of you. To put it more clearly, you cannot relist or duplicate in the background while watching videos on YouTube for example. Chrome has to be actively open while PrimeLister will relist and duplicate.