Is it safe to install a "companion app" with a Firefox extension?

I appreciate your reply!

This problem has really been something I haven’t been able to solve. I’m just trying to do everything to make this work!

I guess I paid twice because I thought the App writer wouldn’t be giving up my user privacy or user security to anyone if I paid extra? It’s just unbelievably how easy it’d be for an App writer to pass along personal user data to other people/entities.

By the way, TommyCummer, welcome to the community! I can tell you’ll be a great asset here!