Earlier quoted context omitted.
You want to point us towards where ... on Bugzilla and the Mozilla project wiki pages and the source code and all the other things you mentioned ... this addon was discussed?
Firefox is open source. Someone had to have committed code to make this happen, which you can use to go dig up the history if you want to. But you're not going to do that. Which is your right; it's just hard to complain about not being consulted/not getting to review/etc. when you're talking about a piece of open-source software with public repositories and trackers. Anyone on earth is allowed to see what's going on…
Firefox is not fully open source.