I don't think this is the full story. They claim the add-on was disabled by default, and needed to be manually activated.

Note that the description of the Looking Glass addon was "MY REALITY IS JUST DIFFERENT THAN YOURS."

Note also that I have never activated such add-on.

Now, If I go to about:studies (for those not familiar with SHIELD studies https://support.mozilla.org/en-US/kb/shield) I see the following 'study':

pug-experience Complete • My reality is different than yours

So, there was a Mozilla study, with almost the shame shady description, which DID run by default, at least for some users.

Are the Looking Glass add-on and this SHIELD study completely unrelated? Why do they share the same description? Why is Mozilla using these shady descriptions in the first place?

Probably I am just being paranoid, but Mozilla has done nothing to gain my trust, lately.