Examine source code of Page Notes and Draw

{
  "manifest_version": 3,
  "name": "Page Notes and Draw",
  "version": "1.0.0",
  "description": "Draw, doodle and annotate on any web page. Freehand pen, shapes and text notes, saved per page and restored whenever you switch the extension back on.",
  "author": "Georges Atalla",
  "homepage_url": "https://github.com/Ggs91/page-notes-and-draw",
  "browser_specific_settings": {
    "gecko": {
      "id": "page-notes-and-draw@georgesatalla",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Page Notes and Draw (Alt+Shift+N)",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    }
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+Shift+N"
      },
      "description": "Toggle Page Notes and Draw"
    }
  }
}