This is a like a case study in how to [not] handle messaging towards technical users. There's no issue here, but it just appears like Firefox is now shipping apps or something, rather than essentially a bookmark.
What led you to believe that the linked page was targeted towards technical users?
Not saying it was. Just that FF has a lot of sensitive, technical, users, so Mozilla has to deal with this insanity it looks like. Thus, they might consider having a "how it works" or "why" section to calm such users.
Can't they just look at the source code?
that's certainly what I came to complain about, until I read the comment you replied to.