Validity

Click the icon in the address bar or press Alt+Shift+V to validate the current page. Results can be seen in Chrome's JS console.

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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "__MSG_extn_name__",
  "version": "4.1.0",
  "default_locale": "en_GB",
  "minimum_chrome_version": "53",
  "description": "__MSG_extn_description__",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "64": "icons/64.png",
    "128": "icons/128.png"
  },
  "permissions": [
    "http://*/*",
    "https://*/*",
    "storage"
  ],
  "content_security_policy": "script-src 'self' https://ssl.google-analytics.com; object-src 'self'",
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "validity.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background/controller.js",
      "background/net.js",
      "background/stats.js",
      "background/nu.js",
      "background/xml.js",
      "background/ui.js",
      "background/util.js",
      "background/opts.js",
      "background/upgrade.js"
    ]
  },
  "page_action": {
    "default_icon": {
      "19": "icons/19.png",
      "38": "icons/38.png"
    },
    "default_title": "__MSG_page_action_title__"
  },
  "commands": {
    "_execute_page_action": {
      "suggested_key": {
        "default": "Alt+Shift+V",
        "mac": "Alt+Shift+V"
      },
      "description": "__MSG_page_action_title__"
    }
  },
  "options_page": "options.html",
  "manifest_version": 2
}