Examine source code of Arabic Dictionary

{
  "manifest_version": 2,
  "name": "Arabic Dictionary",
  "description": "A wiktionary based dictionary for Arabic words.",
  "version": "1.4",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "64": "icons/icon64.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "https://en.wiktionary.org/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Arabic Definition & Etymology",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "content-scripts/content.css"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3a8a34dd-179e-4446-852a-33b1c0b861ea}"
    }
  }
}