Examine source code of Clean Wikipedia

{
  "applications": {
    "gecko": {
      "id": "CleanWiki@example.org",
      "strict_min_version": "65.0"
    }
  },
  "name": "Clean Wikipedia",
  "version": "4",
  "description": "Intelligently cleans wikipedia and removes citation numbers to make it easy to copy and paste text. Also removes annoying donation banners and visually overhauls the page to make reading a pleasure",
  "icons": {
    "128": "img128.png",
    "256": "img256.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.wikipedia.org/*"
      ],
      "run_at": "document_idle",
      "js": [
        "wiki.js"
      ],
      "css": [
        "wiki.css"
      ]
    }
  ],
  "manifest_version": 2
}