As a keen NixOS user/contributor, if your only needs are i3 and Firefox, then I do not recommend NixOS to you. ~Any distribution can meet your needs.
NixOS is great for:
* shortening the divide between the user and upstream: not just release lag, but also the ability to contribute to upstream. NixOS makes it trivial to write a patch and deploy it your system, something I wouldn't usually bother with Debian, for example, because the same process was so frictionful.
NixOS is great for:
* shortening the divide between the user and upstream: not just release lag, but also the ability to contribute to upstream. NixOS makes it trivial to write a patch and deploy it your system, something I wouldn't usually bother with Debian, for example, because the same process was so frictionful.
* configuring services
* packaging ad-hoc code/scripts