Examine source code of One Page Reader

{
  "author": "DevAttendant",
  "description": "__MSG_appDesc__",
  "name": "One Page Reader",
  "version": "1.1.0",
  "default_locale": "en",
  "icons": {
    "48": "icons/48.png",
    "96": "icons/96.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "page": "background.html"
  },
  "applications": {
    "gecko": {
      "id": "one-page-reader@devattendant.de"
    }
  },
  "manifest_version": 2,
  "web_accessible_resources": [
    "assets/src/entries/background/append-Fvz0Btx_.js",
    "assets/utils-Q4Pq2Dqq.js",
    "src/entries/background/append.js"
  ]
}