Examine source code of CS Encryptor

{
  "manifest_version": 2,
  "name": "CS Encryptor",
  "version": "0.5",
  "description": "Secure text encryption/decryption tool by Cyber Society",
  "icons": {
    "48": "icons/icon48.jpg",
    "128": "icons/icon128.jpg"
  },
  "permissions": [
    "contextMenus",
    "storage",
    "activeTab",
    "notifications"
  ],
  "web_accessible_resources": [
    "styles.css",
    "icons/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon48.jpg",
      "128": "icons/icon128.jpg"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{734c7b8c-6023-495e-9d49-3d27a8fa0b01}"
    }
  }
}