Firefox

Firefox is a graphical web browser developed by Mozilla.

Installation

NixOS

environment.systemPackages = with pkgs; [ firefox ];

It's also possible to install Firefox via Home Manager:

# If you want to configure Firefox (consult Home Manager's docs for options):
programs.firefox.enable = true;

# If you don't want to configure Firefox:
home.packages = with pkgs; [ firefox ];

See: Home Manager's manual.

Non-NixOS

$ nix-env -iA nixos.firefox

Other Firefox Editions

Nixpkgs also offers other variants of Firefox aside from the ones stated above - these may suit your needs more comfortably than vanilla Firefox.

Note: The packages for the variants listed below are installed instead of the normal firefox package and each other, which means that you'll have to choose one among these options.

Wayland

Users running a Wayland compositor (such as Sway) may want to use a Wayland-compatible build of Firefox. This can be achieved by replacing the firefox package with firefox-wayland instead.

Screen Sharing

When using Firefox with Wayland, screen sharing options might be limited and require additional configuration (exact capabilities vary with different compositors).

• Use firefox-wayland, e.g.:

  # NixOS system wide Firefox install
  environment.systemPackages = with pkgs; [ firefox-wayland ]
  
  # Home Manager when not using any additional Firefox options
  home.packages = with pkgs; [ firefox-wayland ]
  
  # Home Manager programs.firefox style
  programs.firefox = {
    enable = true;
    package = pkgs.wrapFirefox pkgs.firefox-unwrapped {
      forceWayland = true;
      extraPolicies = {
        ExtensionSettings = {};
      };
    };
  };
  

• Enable PipeWire:

  services.pipewire.enable = true;
  

• Enable xdg desktop integration:

  xdg = {
    portal = {
      enable = true;
      extraPortals = with pkgs; [
        xdg-desktop-portal-wlr
        xdg-desktop-portal-gtk
      ];
      gtkUsePortal = true;
    };
  };
  

• Set environment variables to hint Firefox to use Wayland features. E.g.:

  # Classical NixOS setup
  environment.sessionVariables = {
     MOZ_ENABLE_WAYLAND = "1";
     XDG_CURRENT_DESKTOP = "sway"; 
  };
  
  # Home Manager setup
  home.sessionVariables = {
    MOZ_ENABLE_WAYLAND = 1;
    XDG_CURRENT_DESKTOP = "sway"; 
  };
  

• If you are not using Sway you can remove the 'XDG_CURRENT_DESKTOP = "sway";' line
• Ensure that the environment variables are correctly set for the user systemd units. E.g.:

  # Sway users might achieve this by adding the following to their Sway config file
  # This ensures all user units started after the command (not those already running) set the variables
  exec systemctl --user import-environment
  

Firefox ESR

This is the Extended Support Release of Firefox provided by Mozilla, this release receives only security updates and possesses a more relaxed cadence of feature implementation. You can install it by using the firefox-esr package.

Mozilla Distributed Binaries

Mozilla themselves provide official pre-built Firefox binaries. It is possible to install these packages through Nix by using the -bin suffix with the package. So you'd use firefox-bin instead of the normal package. This will download the binary from Mozilla's servers and install it on your system.

Firefox nightly

Nightly builds are daily builds of Firefox from the Mozilla-central repository

To use them

nixpkgs.overlays =
  let
    # Change this to a rev sha to pin
    moz-rev = "master";
    moz-url = builtins.fetchTarball { url = "https://github.com/mozilla/nixpkgs-mozilla/archive/${moz-rev}.tar.gz";};
    nightlyOverlay = (import "${moz-url}/firefox-overlay.nix");
  in [
    nightlyOverlay
  ];
environment.systemPackages = with pkgs; [ latest.firefox-nightly-bin ];

FAQ

How to run Firefox without pulseaudio and still get audio output?

Replace libpulseaudio by libpressureaudio, which uses apulse to emulate PulseAudio but uses ALSA directly. So, you don't need to install/enable pulse audio.

{ pkgs ? import <nixpkgs> {} }:
(pkgs.wrapFirefox.override {libpulseaudio = pkgs.libpressureaudio;}) pkgs.firefox-unwrapped {}

and installing it with nix-env -f firefox.nix -i.

When using Home Manager, add the following to your configuration:

programs.firefox.package = (pkgs.wrapFirefox.override { libpulseaudio = pkgs.libpressureaudio; }) pkgs.firefox-unwrapped { };

I want Firefox, what is Nightly?

Mozilla's trademarks on Firefox disallows distributing unofficial builds using the Firefox trademark. This is why the Nix-built Firefox is named Nightly.

The official builds are available by enabling unfree and installing firefox-bin.

Firefox ESR and Oracle JDK

Note: It is not clear whether this section is out of date, and whether any Firefox release in Nixpkgs allows to use Java. See https://github.com/NixOS/nixpkgs/issues/84909.

Firefox stops support of Java plugin. To use Java plugin you have to use special Firefox ESR, Extended Support Release.

Also, Oracle doesn't provide a nice way to automate Oracle JDK installation without accepting the license. See https://gist.github.com/danbst/30165b59996fb403068c74a95b108d6f for possible way to combine automated JDK and Firefox ESR download.

Tips

Enabling Plasma Browser Integration

1. Add the following line to your configuration.nix:

nixpkgs.config.firefox.enablePlasmaBrowserIntegration = true;

If you're wondering where this part is coming from see NixOS Manual:Customising Packages

2. Install KDE's Firefox extension.

Use xinput2

You can make Firefox use xinput2 by setting the MOZ_USE_XINPUT2 environment variable. This improves touchscreen support and enables additional touchpad gestures. It also enables smooth scrolling as opposed to the stepped scrolling that Firefox has by default. To do this, put the following in your config:

environment.sessionVariables = {
  MOZ_USE_XINPUT2 = "1";
};

Troubleshooting

If you can't start the browser because of a configuration error

For example:

firefox
1554035168269	Marionette	FATAL	Error de análisis XML: entidad indefinida
Ubicación: chrome://browser/content/browser.xul
Línea 2526, columna 13:            <toolbarbutton id="tracking-protection-preferences-button"
JavaScript error: resource:///modules/aboutpages/AboutPrivateBrowsingHandler.jsm, line 28: TypeError: this.pageListener is undefined

An easy way to get away from this is to start firefox with the firefox -safe-mode command. Then you can troubleshoot your actual problem or you can call your luck by calling the refresh option (a special button will appear when firefox starts in this mode). This will reset your configuration to a sane state and you will be usually able to start the browser again, but you will lose most of your customization.

nativeMessagingHosts don't work

such as enablePlasmaBrowserIntegration, enableGnomeExtensions, and enableBrowserpass.

They do not work with the firefox-bin derivation or with firefox installed via nix-env

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