Examine source code of Roodloos

{
  "name": "Roodloos",
  "version": "1.2.0",
  "manifest_version": 2,
  "description": "Nooit meer rode cijfers op Magister. Deze extensie kleurt alle onvoldoendes zwart. Zo vallen ze minder op.",
  "homepage_url": "https://github.com/StachRedeker/roodloos",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "default_locale": "nl",
  "content_scripts": [
    {
      "matches": [
        "https://*.magister.net/*"
      ],
      "js": [
        "thirdparty/jquery-3.5.1.min.js",
        "src/inject/inject.js"
      ],
      "run_at": "document_end"
    }
  ]
}