Domkit

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Domkit",
  "short_name": "DMKT",
  "version": "2.1.6",
  "description": "Domkit is a Chrome extension for analyzing the CSS box model of individual HTML elements.",
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": "icons/orange-box-48x48.png"
  },
  "content_scripts": [
    {
      "js": [
        "js/content.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "16": "icons/orange-box-16x16.png",
    "48": "icons/orange-box-48x48.png",
    "128": "icons/orange-box-128x128.png"
  },
  "permissions": [
    "storage"
  ]
}