Examine source code of wikiless FTW

{
  "name": "wikiless FTW",
  "description": "Use wikiless instead of wikipedia",
  "version": "1.0",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "256": "ftw.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://*.wikipedia.org/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a11cd7ea-d112-4651-8932-64c97f2af686}"
    }
  }
}