Examine source code of GraphQL DevTools

{
  "name": "GraphQL Network",
  "version": "1.5",
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "@graphqldevtools",
      "strict_min_version": "57.0"
    }
  },
  "devtools_page": "devtools.html",
  "icons": {
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "tabs",
    "http://*/*",
    "https://*/*"
  ]
}