diff --git a/web/buildExtension.js b/web/buildExtension.js
index 206408c..4984ab2 100644
--- a/web/buildExtension.js
+++ b/web/buildExtension.js
@@ -1,7 +1,37 @@
+const fs = require("fs");
+const os = require("os");
+const path = require("path");
 const webpack = require("webpack");
 process.env.BUILD_TYPE = "extension";
 const config = require("./webpack.config.js");
 
+const PATH_TO_EXTS = path.join(
+  os.homedir(),
+  "Library/ApplicationSupport/hh3/ext"
+);
+const HH_EXT_DIR = path.join(__dirname, "../ext");
+let exts = fs.readdirSync(PATH_TO_EXTS);
+exts = exts.filter((e) => e !== ".git");
+
+function deleteF(path) {
+  const isDir = fs.lstatSync(path).isDirectory();
+  if (isDir) fs.rmSync(path, {recursive: true});
+  else fs.unlinkSync(path);
+}
+
+for (const ext of exts) {
+  if (fs.existsSync(path.join(HH_EXT_DIR, ext)))
+    deleteF(path.join(HH_EXT_DIR, ext));
+
+  const source = path.join(PATH_TO_EXTS, ext);
+  const dest = path.join(HH_EXT_DIR, ext);
+
+  fs.cpSync(source, dest, {
+    recursive: true,
+  });
+  console.log(`${source} -> ${dest}`);
+}
+
 webpack.webpack(config, (err, stats) => {
   if (!stats?.compilation) {
     console.log(err);
@@ -21,5 +51,10 @@ webpack.webpack(config, (err, stats) => {
         })
       );
     }
+    for (let ext of exts) {
+      ext = path.join(HH_EXT_DIR, ext);
+      deleteF(ext);
+      console.log(`✕ ${ext}`);
+    }
   }
 });