How to disable Firefox updates forever?

Hello, I'm pretty tired of Firefox updating itself without asking me or warning me, just telling me that it's going to force me to restart and kill all of my private windows without any chance of continuing browsing. I'd like to disable updates but it seems that they are forced upon the user regardless of choice. Is there a way to prevent them from happening? I managed to disable them on Linux by some miracle but can't find a way to do the same on Mac. I'd also like to remove the little popup that suggests updates every time I open it. No chance of that either? The browser is made for browsing and not for serving the needs of the browser. I really love what Firefox used to be but at this point I might as well switch to something else. The blatant disregard for user experience is what's killing me.