Merlin
CSSLint

CSSLint

It will validate the CSS formatting rules.

Merlin
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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "CSSLint",
  "version": "1.0",
  "description": "It will validate the CSS formatting rules.",
  "icons": {
    "16": "img/icon-16.png",
    "48": "img/icon-48.png",
    "128": "img/icon-128.png"
  },
  "browser_action": {
    "default_title": "CSSLint - Instant and Beautiful",
    "default_popup": "popup.html",
    "default_icon": "img/icon-48.png"
  },
  "manifest_version": 2,
  "content_security_policy": "script-src 'self' https://ajax.googleapis.com; object-src 'self'"
}