diff --git a/ExtensionBuilder.cjs b/ExtensionBuilder.cjs
index e40be4a..68a48d6 100644
--- a/ExtensionBuilder.cjs
+++ b/ExtensionBuilder.cjs
@@ -1,6 +1,7 @@
 const fs = require("fs");
 const jszip = require("jszip");
 const { sep } = require("path");
+const crypto = require("crypto");
 
 const id = crypto.randomUUID().replaceAll("-", "");
 function adaptContent(text, isFirefox) {
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..9ed2fe7
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,20 @@
+MIT License
+
+Copyright (c) 2024 Dinoosauro
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.