Use GM_ instead of injecting manually

inject.user.js

@@ -1,24 +1,26 @@
 // ==UserScript==
-// @name         Scratch 3 Developer Tools
-// @namespace    https://github.com/griffpatch/Scratch3-Dev-Tools
-// @version      1.0.0
-// @description  ...to enhance your Scratch Editing Experience. Injects the code on the source code. Ported, based on the extension. (https://chrome.google.com/webstore/detail/scratch-3-developer-tools/phacniajokfchdcamjhonkbhlcipplno)
-// @author       griffpatch, ported by Hans5958
-// @match        http*://scratch.mit.edu/projects/editor
-// @match        http*://scratch.mit.edu/projects/*
-// @match        http*://scratch.mit.edu/projects/*/editor
-// @icon         https://cdn.jsdelivr.net/gh/griffpatch/Scratch3-Dev-Tools/bigIcon.png
-// @updateURL    https://cdn.jsdelivr.net/gh/griffpatch/Scratch3-Dev-Tools/inject.user.js
-// @grant        none
+// @name          Scratch 3 Developer Tools
+// @namespace     https://github.com/griffpatch/Scratch3-Dev-Tools
+// @version       1.0.1
+// @description   ...to enhance your Scratch Editing Experience. Injects the code on the source code. Ported, based on the extension. (https://chrome.google.com/webstore/detail/scratch-3-developer-tools/phacniajokfchdcamjhonkbhlcipplno)
+// @author        griffpatch, ported by Hans5958
+// @match         http*://scratch.mit.edu/projects/editor
+// @match         http*://scratch.mit.edu/projects/*
+// @match         http*://scratch.mit.edu/projects/*/editor
+// @updateURL     https://cdn.jsdelivr.net/gh/griffpatch/Scratch3-Dev-Tools/inject.user.js
+// @icon          https://cdn.jsdelivr.net/gh/griffpatch/Scratch3-Dev-Tools/bigIcon.png
+// @icon64        https://cdn.jsdelivr.net/gh/griffpatch/Scratch3-Dev-Tools/favicon.png
+// @require       https://cdn.jsdelivr.net/gh/griffpatch/Scratch3-Dev-Tools/inject3.js
+// @resource	  css https://cdn.jsdelivr.net/gh/griffpatch/Scratch3-Dev-Tools/inject.css
+// @grant         GM_addStyle
+// @grant         GM_getResourceText
 // ==/UserScript==
 
-var js = document.createElement('script')
-js.src = 'https://cdn.jsdelivr.net/gh/griffpatch/Scratch3-Dev-Tools/inject3.js'
+GM_addStyle(GM_getResourceText("css"));
 
-var css = document.createElement('link')
-css.href = 'https://cdn.jsdelivr.net/gh/griffpatch/Scratch3-Dev-Tools/inject.css'
-css.rel = 'stylesheet'
+/*
 
-var head = document.getElementsByTagName('head')[0]
-head.appendChild(js)
-head.appendChild(css)
+Q: Where's the script?
+A: It's on the @require. It takes the code directly on the repository. This is just an injection script.
+
+*/