manifest.json

{
    "manifest_version": 3,
    "name": "One-page link checker 🔗",
    "description": "404 Link Checker is a powerful extension that allows you to quickly check links on a web page.",
    "version": "1.0",
    "permissions": [
      "activeTab",
      "scripting"
    ],
    "action": {
      "default_popup": "popup.html",
      "default_icon": {
        "16": "images/icon16.png",
        "48": "images/icon48.png",
        "128": "images/icon128.png"
      }
    },
    "icons": {
      "16": "images/icon16.png",
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    },
    "web_accessible_resources": [
      {
        "resources": ["content.js"],
        "matches": ["<all_urls>"]
      }
    ]
  }