Examine source code of wikilata

{
  "manifest_version": 2,
  "name": "wikilata",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": "icon.png"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "webRequest",
    "webRequestBlocking",
    "*://*.wikipedia.org/*"
  ],
  "version": "0.6"
}