I use gnome shell & I have always noticed that if I launch firefox in workspace 2 or any workspace other than workspace 1, overview is triggered.
I just updated my laptop this evening and now I notice that this behaviour continues but now sometimes when overview is triggred by launching firefox, firefox is off centre to the right in overview and the x to close the appication that appears on applications in overview is in the centre of the screen.
See link to screencast:
I want to file a bug but am not sure where
to file - Red Hat bugzilla? and what should the component