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://*/*" 
  ]
}