Examine source code of VocabLink: Synonym Match

{
  "manifest_version": 2,
  "name": "VocabLink: Synonym Match",
  "version": "1.0",
  "description": "Expand your English vocabulary dynamically! VocabLink challenges you to match words with their correct synonyms through a fast-paced, interactive multiple-choice matrix.",
  "icons": {
    "48": "vocablink_icon.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "VocabLink"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{af8ee453-56bf-47f0-8ee5-360175f22c96}",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}