Examine source code of Postlight Reader

{
  "manifest_version": 2,
  "name": "Postlight Reader",
  "description": "Postlight Reader - Clear away the clutter from all of your articles. Instantly.",
  "version": "9",
  "background": {
    "scripts": [
      "background.bundle.js"
    ],
    "persistent": true
  },
  "permissions": [
    "contextMenus",
    "tabs",
    "storage",
    "activeTab"
  ],
  "browser_action": {
    "default_title": "Postlight Reader"
  },
  "icons": {
    "16": "img/icon-16.png",
    "48": "img/icon-48.png",
    "128": "img/icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>",
        "*://*/*"
      ],
      "css": [
        "content.css"
      ],
      "js": [
        "content.bundle.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true,
    "chrome_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "mercury-kindle@postlight.com",
      "strict_min_version": "53.0"
    }
  },
  "content_security_policy": "script-src 'self' 'unsafe-eval' https://www.google-analytics.com https://platform.twitter.com https://connect.facebook.net/; object-src 'self'",
  "web_accessible_resources": [
    "app.html",
    "root-url-warning.html",
    "rootUrlWarning.js"
  ]
}