Examine source code of Nitter Redirect Button

{
  "manifest_version": 2,
  "name": "Nitter Redirect",
  "version": "1.0.1",
  "description": "Automatically adds a nitter redirect button to twitter profiles.",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "content_scripts": [
    {
      "run_at": "document_end",
      "matches": [
        "*://*.twitter.com/*"
      ],
      "js": [
        "dist/NitterRedirect.js"
      ],
      "css": [
        "styles/NitterRedirect.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e52acaf3-0eaa-4584-9cc2-df5329d0966f}"
    }
  }
}