Codingame puzzles accordions

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Codingame puzzles accordions",
  "version": "1.0",
  "manifest_version": 2,
  "description": "Allows collapsing puzzle sections",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "https://www.codingame.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.codingame.com/*"
      ],
      "js": [
        "libs/jquery-2.2.2.min.js",
        "src/inject/inject.js"
      ]
    }
  ]
}