I doubt this is going to happen. However since you are effectively talking about trust let's look at a few things. No matter who's program you are using you need to trust them. As such using BT means you not only trust the development team, but also the authors of each and every package that is included.
Now that's the same if you are talking about nmap, or firefox or even the gnome file manager. Now one of the things that makes linux what it is, is that since it is open source you are free to look at the code that makes up the majority of the packages on BT. There are a few packages that are non-free and of course each of these packages are noted. This ability allows one to have a certain level of trust that the code is doing what it is/was designed to do.
So the same thing applies to Firefox, and many of the add-ons that you are talking about. Again it is up to each individual to determine if having such tools (or even BT) for that matter is right for them.