How did you set your firefox up like this?

Thanks a lot. I will give it a try. By the way, are you also using the NUR? Do you maybe know if I can configure the nix.registry to allow using NUR packages using nix shell as well?

Are there any tradeoffs I need to accept to use this?

While I do like custom text editors, I feel like bad debugging is a no go.

Are flatpaks really that bad? Why would they even require more resources?

Sounds like my story. I think I started with Ubuntu, but installed mints cinnamon Desktop environment later on.

I suppose this made you work in it later on as well?

I switched around one and a half years ago. I must say, there are some hurdles to using NixOS. Mainly I dislike that it always takes around 20 times the effort to start and project. You make up for the initial time investment, because you end up with a far more stable setup, but still it does take some willpower to get things started.