firefox with video acceleration

roles/desktop.nix

@@ -4,8 +4,9 @@
 { config, lib, pkgs, ... }:
 
 let
-  unstable = import <nixos-unstable> {};
+  unstable = import <nixos-unstable> { config.allowUnfree = true; };
 in {
+
   programs.sway = {
     enable = true;
     extraPackages = with pkgs; [
@@ -42,14 +43,26 @@ in {
   ];
 
   environment.systemPackages = with pkgs; [
+    # firefox also needs:
+    #
+    # gfx.webrenderer.enabled = true
+    # widget.wayland-dmabuf-vaapi.enabled = true
+    #
+    # check in `about:support` that
+    #  * Composing -> Webrenderer
+    unstable.firefox-bin
+    libva
+    libva-utils
+    mesa
+
     librsvg
     unstable.mypaint
     unstable.mypaint-brushes
 
     hicolor-icon-theme
     numix-icon-theme
+
     alacritty
-    firefox
     mumble
     neofetch
     inkscape
@@ -65,11 +78,12 @@ in {
         text = ''
           #! ${pkgs.bash}/bin/bash
 
-	  export MOZ_ENABLE_WAYLAND=1
-	  export QT_QPA_PLATFORM=wayland-egl
-	  export QT_WAYLAND_FORCE_DPI=physical
-	  export SDL_VIDEODRIVER=wayland
-	  export _JAVA_AWT_WM_NOREPARENTING=1
+          export _JAVA_AWT_WM_NOREPARENTING=1
+          export MOZ_ENABLE_WAYLAND=1
+          export QT_AUTO_SCREEN_SCALE_FACTOR=0
+          export QT_WAYLAND_FORCE_DPI=96
+          export QT_QPA_PLATFORM=wayland-egl
+          export SDL_VIDEODRIVER=wayland
           exec ${pkgs.dbus}/bin/dbus-run-session ${pkgs.sway}/bin/sway
         '';
       }
@@ -85,4 +99,8 @@ in {
   };
 
   services.printing.enable = true;
+
+  hardware.opengl =  {
+    enable = true;
+  };
 }

roles/dev.nix

@@ -5,8 +5,6 @@
 
 let
   unstable = import <nixos-unstable> {};
-  mozilla = import <mozilla> {};
-
 in {
   environment.systemPackages = with pkgs; [
     emacs