[Nix-dev] Java plugin for FF

[James Cook]

> $ nix-env -iA firefoxWrapper /etc/nixos/nixpkgs
> error: attribute `firefoxWrapper' in selection path `firefoxWrapper' not
> found
>
> Also I don't have /etc/nixos/nixpkgs folder.

Substitute any checkout of nixpkgs for /etc/nixos/nixpkgs.  If you're
using nix-channel, it might be under ~/.nix-defexpr/channels.  On my
system I use /nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs
.