Earlier quoted context omitted.
Yeah, I get the concept of using different browsers for different things to compartmentalize, and I've tried it, but to me it just seems like I'm making my life more complicated switching back and forth, and I feel like it's cluttering up my system. I love how Librewolf takes privacy to another level, but honestly, all I want is Firefox without all the BS and the ability to disable things I don't want (and not having…
A custom user.js will do the job
That said it is possible to have firefox start cleanly with absolutely no network traffic except for sites you visit.