Examine source code of PixiJS Devtools

{
  "manifest_version" : 3 ,
  "name" : "PixiJS Devtools",
  "description" : "Debug games and apps written with PixiJS",
  "version" : "3.4.0",
  "devtools_page": "pixi-devtools.html",
  "icons" : {
    "48" : "icon.png",
    "96" : "icon@2x.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "pixi-inspector@bfanger.nl",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}