Examine source code of Reader View

{
  "name": "__MSG_app_name__",
  "description": "__MSG_app_description__",
  "default_locale": "en",
  "short_name": "reader-view",
  "author": "Alexey Kuznetsov",
  "version": "1.0.7",
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "reader-view@freebusinessapps.net",
      "strict_min_version": "42.0"
    }
  },
  "permissions": [
    "storage",
    "activeTab",
    "contextMenus",
    "https://*.freebusinessapps.net/*",
    "notifications"
  ],
  "optional_permissions": [
    "tabs",
    "*://*/*"
  ],
  "background": {
    "scripts": [
      "config.js",
      "common.js"
    ]
  },
  "page_action": {
    "default_title": "__MSG_app_name__",
    "default_icon": {
      "16": "data/icons/16.png",
      "32": "data/icons/32.png",
      "48": "data/icons/48.png",
      "64": "data/icons/64.png"
    }
  },
  "homepage_url": "https://readerview.freebusinessapps.net",
  "icons": {
    "16": "data/icons/16.png",
    "32": "data/icons/32.png",
    "48": "data/icons/48.png",
    "64": "data/icons/64.png",
    "128": "data/icons/128.png",
    "256": "data/icons/256.png"
  },
  "options_ui": {
    "page": "data/options/index.html",
    "chrome_style": true
  },
  "commands": {
    "toggle-reader-view": {
      "description": "__MSG_app_command__"
    }
  }
}