WCAG Color contrast checker

To check the color contrast between foreground and background of the texts

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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "author": "Jorge Rumoroso",
  "manifest_version": 3,
  "version": "3.8.4",
  "icons": {
    "48": "icons/icon_large.png",
    "96": "icons/icon_large_96x96.png",
    "128": "icons/icon128_with_margin.png"
  },
  "default_locale": "en",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_scripts/contrastChecker.js"
      ],
      "css": [
        "css/inDocumentStyles.css"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "background": {
    "service_worker": "service-worker.js"
  },
  "permissions": [
    "activeTab",
    "storage",
    "webNavigation"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_icon": {
      "32": "icons/icon_overlay.png"
    },
    "default_title": "WCAG Color contrast checker"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "html/*",
        "css/*",
        "getFrameId",
        "_locales/*"
      ],
      "matches": [
        "<all_urls>"
      ],
      "extension_ids": []
    }
  ]
}