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manifest.json

{
  "manifest_version": 3,
  "name": "Highlighter",
  "version": "3.1",
  "description": "SEO tool visualizes page structure, titles, paragraphs, and image alts. Checks design, Google cache, duplicate 404s, and H1 errors.",
  "action": {
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab",
    "scripting",
    "tabs",
    "webRequest",
    "storage"
  ],
  "background": {
    "service_worker": "background.js"
  },
  "host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "icons": {
    "16": "./Button-Icons/icon.png",
    "48": "./Button-Icons/icon.png",
    "128": "./Button-Icons/icon.png"
  },
  "update_url": "https://edge.microsoft.com/extensionwebstorebase/v1/crx"
}