CSS Used

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "CSS Used",
  "version": "3.0.0",
  "permissions": [
    "tabs"
  ],
  "optional_permissions": [
    "storage"
  ],
  "author": "Bob",
  "icons": {
    "16": "static/icon/16.png",
    "48": "static/icon/48.png",
    "128": "static/icon/128.png"
  },
  "description": "Get all css rules used by the selected DOM and its descendants.",
  "devtools_page": "devtools.html",
  "options_page": "options.html",
  "manifest_version": 3,
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "assets/content.js"
      ],
      "all_frames": true
    }
  ],
  "action": {
    "default_icon": "static/icon/128.png",
    "default_title": "CSS Used For Chrome Devtool",
    "default_popup": "popup.html"
  }
}