Scratch Forum Button Inserter

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Scratch Forum Button Inserter",
  "description": "This automatically adds the scratch.mit.edu 'Discuss' button back.",
  "version": "1.2",
  "permissions": [
    "tabs",
    "https://scratch.mit.edu/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://scratch.mit.edu/*"
      ],
      "js": [
        "jquery-3.2.1.js",
        "insert_main.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_action": {
    "default_icon": "icon-128.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icon-16.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  }
}