Woah, hey Overkill, allow it by site, dont allow globally, this is a popular js to exploit for the plugin feature.
I would recommend allowing it only on sites like MT that you know you can trust.
If your talking about allowing globally in NoScript or Ublock, you may notice it says "not recommended"
that's why, be very stingy with the allow globally option or you may come to regret it.
PeAcE