Examine source code of Js Helper

{
  "manifest_version": 2,
  "name": "Js Helper",
  "short_name": "JsH",
  "description": "Extension for build GTM custom JavaScript variable.",
  "version": "1.0.9",
  "icons": {
    "16": "img/icon16.png",
    "64": "img/icon64.png",
    "128": "img/icon128.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "img/icon16.png",
      "64": "img/icon64.png",
      "128": "img/icon128.png"
    }
  },
  "permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  }
}