Examine source code of Plagiarism Checker

{
  "name": "__MSG_appName__",
  "version": "1.1",
  "manifest_version": 2,
  "description": "__MSG_appDesc__",
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "default_locale": "en",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "scripting",
    "contextMenus",
    "http://*/",
    "https://*/"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'; connect-src https://plagiarisma.net/ https://www.google-analytics.com/;",
  "options_ui": {
    "page": "options.html"
  },
  "browser_action": {
    "default_title": "__MSG_appName__",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bf71523d-7430-4832-97f7-a4dcc5a779f0}"
    }
  }
}