Comment by m463
It phones home, a lot, from the moment you install it. It has plenty of connections to google too.
The good thing is that the source code is mostly* out there and you or someone else can figure out what it's doing.
[*] don't know about drm stuff
There's shady shenanigans from the moment you download the Firefox installer, before you even install it.
Each Firefox download has a unique identifier (2022): https://news.ycombinator.com/item?id=30715163