Ok, not a answer but some visuals how to get it going for dummies like me.

1- Install [Greasemonkey][1] (it is a add on to Firefox in my case)-- you will get a new icon on the top right of your menu bar AFTER restarting Firefox.

[Install the Script][2]:

![enter image description here][3]
![monkey][4]

While you are still logged in to Stack Exchange 

Go to this website: https://stackexchange.com/oauth/dialog?client_id=4376&scope=write_access&redirect_uri=http://stackexchange.com

Now at the top left where the web site address bar is GET your Token!

Copy the alphanumeric stuff in between the first = (from access_token) up to the next "&"(before expires), including any brackets. 

![Token][5]

There you go, you got your Token !


  [1]: https://addons.mozilla.org/en-Us/firefox/addon/greasemonkey/
  [2]: https://github.com/shu8/SE-Comment-Self-Destruct/raw/master/self-destruct.user.js
  [3]: https://i.sstatic.net/jmPU5.jpg
  [4]: https://i.sstatic.net/0rqN5.jpg
  [5]: https://i.sstatic.net/jjzsD.jpg