firefox: add nix-prefetch-firefox-extension script

scripts/default.nix

@@ -145,6 +145,10 @@
     print-battery-icon = [ ];
     controller-battery = [ print-battery-icon ];
     mouse-battery = [ print-battery-icon ];
+    nix-prefetch-firefox-extension = [
+      nix
+    ];
+
     _docker-block-external-connections = [
       iptables
       gawk

scripts/nix-prefetch-firefox-extension

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+set -euo pipefail
+
+hash="$(nix-prefetch-url --type sha256 "$@")"
+
+nix-hash --to-sri --type sha256 "$hash" 2>/dev/null

user/firefox.nix

@@ -87,6 +87,11 @@ in
             url = "https://addons.mozilla.org/firefox/downloads/file/1176165/corretor-65.2018.12.8.xpi";
             hash = "sha256-/rFQtJHdgemMkGAd+KWuWxVA/BwSIkn6sk0XZE0LrGk=";
           })
+          (pkgs.fetchFirefoxAddon {
+            name = "new_tab_same_group";
+            url = "https://addons.mozilla.org/firefox/downloads/file/4602621/new_tab_same_group-1.7.0.xpi";
+            hash = "sha256-oIpQdhW3ma/MCs1hLQMcZluUnaxeW7u9nEM6iovV40E=";
+          })
         ];
       };
       profiles = {
@@ -139,6 +144,11 @@ in
         };
       };
     };
+
+    home.packages = with pkgs; [
+      nix-prefetch-firefox-extension
+    ];
+
     wayland.windowManager.sway = {
       extraConfig = ''
         exec firefox-devedition