Revert "librewolf: Remove unnecessary ublock-origin package"

It turns out that DNS leaks were occurring from a new feature in Firefox
v129+ that uses the system's DNS in favor of the browser's DNS.

See: https://bugzilla.mozilla.org/show_bug.cgi?id=1910593

home/librewolf.nix

@@ -20,6 +20,7 @@ in
 
     profiles.default = {
       extensions = with nix-config.packages.${pkgs.system}; [
+        ublock-origin
         yomitan
         redlib
         new-tab-identity

packages/ublock-origin.nix

@@ -0,0 +1,52 @@
+{
+  lib,
+  stdenvNoCC,
+  fetchurl,
+  unzip,
+  zip,
+}:
+
+stdenvNoCC.mkDerivation (finalAttrs: {
+  pname = "ublock-origin";
+  version = "1.59.0";
+
+  src = fetchurl {
+    url = "https://addons.mozilla.org/firefox/downloads/file/4328681/ublock_origin-${finalAttrs.version}.xpi";
+    hash = "sha256-HbnGdqB9FB+NNtu8JPnj1kpswjQNv8bISLxDlfls+xQ=";
+  };
+
+  dontUnpack = true;
+
+  nativeBuildInputs = [
+    unzip
+    zip
+  ];
+
+  postPatch = ''
+    unzip "$src"
+
+    substituteInPlace ./js/vapi-background-ext.js \
+      --replace-fail "browser.dns instanceof Object" "false"
+
+    substituteInPlace ./js/background.js \
+      --replace-fail "cnameUncloakEnabled: true" "cnameUncloakEnabled: false"
+
+    zip -x env-vars -r ublock-origin.xpi *
+  '';
+
+  installPhase = ''
+    runHook preInstall
+
+    install -Dm644 ublock-origin.xpi "$out/share/mozilla/extensions/{ec8030f7-c20a-464f-9b0e-13a3a9e97384}/uBlock0@raymondhill.net.xpi"
+
+    runHook postInstall
+  '';
+
+  meta = {
+    homepage = "https://addons.mozilla.org/en-US/firefox/addon/ublock-origin/";
+    description = "Efficient wide-spectrum content blocker";
+    license = lib.licenses.gpl3Plus;
+    maintainers = with lib.maintainers; [ donovanglover ];
+    platforms = lib.platforms.all;
+  };
+})