C+w v
C+w s
:tabnew - new blank tab
:tabnew
[i]gt - go to tab [i]
[i]gt
[i]
:tabs - list open tabs
:tabs
:tabm 0 - move current tab to first position
:tabm 0
:tabm [i] - move current tab to position [i]
:tabm [i]
https://gist.github.com/Starefossen/5957088