Start Tor Browser button opens multiple browser windows instead of using already opened one.
This behavior of opening multiple windows instead of getting the first already spawned browser window to user can cause confusion as users might think that they are opening a completely new window meaning a new and a separate session entirely creating a privacy issue. instead a blank tab in current default homepage window can be made to appear or maybe some type of highlight over this first browser window border to alert user that they have already opened it.
To reproduce keep hitting the Start Tor Browser button.