Web Brush

A tool lets you use any webpage as a whiteboard.

Premium users can view and search full source code, and see the source code differences between two versions.

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "Web Brush",
  "version": "1.0",
  "description": "A tool lets you use any webpage as a whiteboard.",
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icons/icon128.png"
  },
  "background": {
    "service_worker": "background.js"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js",
        "html2canvas.js"
      ]
    }
  ]
}