Devtools Status Detector

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Devtools Status Detector",
  "version": "0.0.2",
  "description": "Allows Javascript Developers to know when Chrome Devtools is open/closed. ",
  "devtools_page": "devtools.html",
  "manifest_version": 2,
  "permissions": [
    "tabs",
    "<all_urls>"
  ],
  "icons": {
    "16": "img/icon.png",
    "48": "img/icon.png",
    "128": "img/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/utilities.js",
        "js/content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "js/utilities.js",
      "js/background.js"
    ]
  },
  "page_action": {
    "default_icon": {
      "19": "img/icon.png",
      "38": "img/icon.png"
    },
    "default_title": "Chrome Devtools Status detector"
  },
  "web_accessible_resources": [
    "js/demo-inpage-script.js"
  ]
}