Examine source code of Nubereader offline

{
  "version": "1.2.12resigned1",
  "manifest_version": 2,
  "name": "__MSG_extensionNameOdilo__",
  "description": "__MSG_extensionDescriptionOdilo__",
  "icons": {
    "16": "media/odilo/ico_16.png",
    "24": "media/odilo/ico_24.png",
    "48": "media/odilo/ico_48.png",
    "96": "media/odilo/ico_96.png",
    "112": "media/odilo/ico_112.png",
    "128": "media/odilo/ico_128.png"
  },
  "browser_action": {
    "default_icon": "media/odilo/ico_19.png",
    "default_title": "__MSG_browserTitleOdilo__"
  },
  "permissions": [
    "bookmarks",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js",
      "events.js",
      "config/odilo/global.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.nubereader.es/*",
        "*://*.nubereader.odilotk.es/*",
        "*://*.bibliotecadigital.ceibal.edu.uy/*",
        "*://*.odilotk.es/*",
        "*://*.odilo.us/*",
        "*://*.server-nubereader.odilotk.es/*",
        "*://*.nubereader.odilo.us/*",
        "*://*.educarex.es/*",
        "*://*.eduteca.biblioescolaib.cat/*",
        "*://*.educa.jcyl.es/*"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "default_locale": "es",
  "applications": {
    "gecko": {
      "id": "{966c774e-b939-4caa-9ad2-b3b91a94fc9b}",
      "strict_min_version": "55.0"
    }
  }
}