Examine source code of EPUBReader

{
  "manifest_version": 2,
  "name": "EPUBReader",
  "description": "__MSG_extensionDescription__",
  "icons": {
    "16": "skin/icon_16.png",
    "32": "skin/icon_32.png",
    "48": "skin/icon_48.png",
    "128": "skin/icon_128.png"
  },
  "version": "2.0.13",
  "default_locale": "en",
  "homepage_url": "http://www.epubread.com/",
  "author": "Michael Volz",
  "browser_action": {
    "default_icon": {
      "16": "skin/icon_16.png",
      "32": "skin/icon_32.png",
      "48": "skin/icon_48.png",
      "128": "skin/icon_128.png"
    },
    "default_title": "EPUBReader",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "permissions": [
    "webNavigation",
    "webRequest",
    "webRequestBlocking",
    "downloads",
    "<all_urls>",
    "storage"
  ],
  "web_accessible_resources": [
    "reader.html"
  ]
}