Examine source code of language class

{
  "manifest_version": 2,
  "name": "Cornish Sensim",
  "version": "1.0.0",
  "description": "Learn Cornish (Kernewek) while you browse. 3 new words replace themselves every day.",
  "permissions": [
    "storage",
    "activeTab",
    "*://*/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "vocab.js",
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Cornish Sensim"
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6522c26b-431b-4e29-8661-2dd745a7fe17}",
      "strict_min_version": "91.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}