Examine source code of Inkbox

{
  "manifest_version": 3,
  "name": "Inkbox",
  "description": "Send any web article to your e-reader in one click. Download any web page to PDF or EPUB.",
  "version": "1.0.0",
  "icons": {
    "16": "icon-16.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "cookies",
    "scripting"
  ],
  "host_permissions": [
    "http://localhost:3000/*",
    "https://useinkbox.app/*",
    "https://*.useinkbox.app/*",
    "https://*.clerk.accounts.dev/*",
    "https://fonts.googleapis.com/*",
    "https://fonts.gstatic.com/*",
    "https://*/*",
    "http://*/*"
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self' 'wasm-unsafe-eval'; object-src 'self';"
  },
  "action": {
    "default_title": "Inkbox",
    "default_icon": {
      "16": "icon-16.png",
      "48": "icon-48.png"
    },
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@useinkbox.app",
      "data_collection_permissions": {
        "required": [
          "websiteContent",
          "browsingActivity"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}