Examine source code of Base16 Everything

{
  "manifest_version": 2,
  "name": "Base16 Everything",
  "version": "1.1.1",
  "description": "Convert any website to base16 color schemes with smooth transitions",
  "content_security_policy": "script-src 'self' 'wasm-unsafe-eval'; object-src 'self'",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting",
    "webNavigation",
    "<all_urls>"
  ],
  "optional_permissions": [
    "nativeMessaging"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a05fa7af-a38d-4616-aadb-5acab1f22ee3}",
      "data_collection_permissions": {
        "required": [
          "browsingActivity"
        ],
        "optional": [
          "technicalAndInteraction",
          "authenticationInfo",
          "locationInfo"
        ]
      }
    }
  },
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png"
    },
    "default_title": "Base16 Everything"
  },
  "background": {
    "page": "background/background.html",
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    "wasm/*"
  ]
}