You should probably add more include patterns for the other stacks.
If you use:
// @match *://*.askubuntu.com/*
// @match *://*.mathoverflow.net/*
// @match *://*.serverfault.com/*
// @match *://*.stackapps.com/*
// @match *://*.stackexchange.com/*
// @match *://*.stackoverflow.com/*
// @match *://*.superuser.com/*
instead of those 2 @includes, in the script; it will work for almost all SE sites -- like Information Security, for example.
