Examine source code of NaturallyLearnThai

{
  "manifest_version": 2,
  "name": "NaturallyLearnThai",
  "version": "1.0",
  "description": "Replaces random words on webpages with thier Thai translations to assist in natural language learning.",
  "icons": {
    "48": "icons/ThaiWordIcon-48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "purify.min.js",
        "NaturallyLearnThai.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{54539188-8cc1-4bd8-be9c-69555e2c8899}"
    }
  }
}