Are you in 3.2.1 or what?
Gimme a couple of hours and I will update my script (it's for 3.2.1 atm), which should solve your problems.
Here you go, that's updated for 3.2.2, tested.
The Extension tab will only appear if there are any extensions using it. If you do not have any extensions installed then it will not show, and neither will it show if the extensions do not have any configuration options.
Thanks for the glass of Chianti.