Examine source code of Simple WCAG Contrast Checker

{
  "manifest_version": 3,
  "name": "Simple WCAG Contrast Checker",
  "version": "1.0.0",
  "author": "HardaWebPro",
  "homepage_url": "https://hardawebpro.com",
  "description": "Scans any webpage and highlights text elements failing WCAG AA or AAA color contrast. Click any flagged element to inspect and fix colors in real time via a draggable panel.",
  "permissions": [
    "activeTab",
    "scripting",
    "storage",
    "clipboardWrite"
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "simple-wcag-contrast-checker@hardawebpro.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_title": "Open Simple WCAG Contrast Checker",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "style-state.js",
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "style.css"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ]
    }
  ]
}