Examine source code of m-wiki-ff

{
  "manifest_version": 2,
  "name": "m-wiki",
  "description": "Automatically redirects Wikipedia to the mobile version.",
  "author": "Johan Dettmar",
  "version": "3.0",
  "permissions": [
    "http://*.wikipedia.org/wiki/*",
    "https://*.wikipedia.org/wiki/*"
  ],
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "http://*.wikipedia.org/wiki/*",
        "https://*.wikipedia.org/wiki/*"
      ],
      "css": [
        "style.css"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "icons": {
    "16": "img/icon16.png",
    "48": "img/icon48.png",
    "128": "img/icon128.png"
  }
}