CSS Undefined Variable Checker

A Devtools extension that detects usages of undefined CSS variables

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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "CSS Undefined Variable Checker",
  "description": "A Devtools extension that detects usages of undefined CSS variables",
  "version": "1.0",
  "manifest_version": 3,
  "permissions": [
    "scripting"
  ],
  "host_permissions": [
    "*://*/*"
  ],
  "devtools_page": "devtools.html",
  "icons": {
    "16": "assets/16x16.png",
    "48": "assets/48x48.png",
    "128": "assets/128x128.png"
  }
}