Unknown Mozilla dev addon "Looking Glass 1.0.3" on browser

Looks like it's a promo for Mr Robot, which is really not ok.

> What's happening? Are you a fan of Mr Robot? Are you trying to solve one of the many puzzles that the Mr Robot team has built? You’re on the right track. Firefox and Mr Robot have collaborated on a shared experience to further your immersion into the Mr Robot universe, also known as an Alternate Reality Game (ARG). The effects you’re seeing are a part of this shared experience.[0]

EDIT: looking at this[1] comment, perhaps it's not a promo?

[0]: https://support.mozilla.org/en-US/kb/lookingglass [1]: https://www.reddit.com/r/firefox/comments/7jh9rv/what_is_loo...

If it was a promo, it would be a real bad promo. I did not watch Mr Robot and that quote did not made me aware of it until people started referencing it here.

The extension is for shield study, when you install Firefox for the first time it asks if you want to take part in it (it is enabled by default though)