Examine source code of Page Notes

{
  "name": "Page Notes",
  "version": "3.5.3",
  "manifest_version": 3,
  "description": "Take notes for web pages and access them with a single click whenever you visit those web pages again. (Syncs to Google Drive)",
  "background": {
    "type": "module",
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "action": {
    "default_title": "Page Notes",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icons/icon_16.png",
    "19": "icons/icon_19.png",
    "48": "icons/icon_48.png",
    "128": "icons/icon_128.png"
  },
  "permissions": [
    "alarms",
    "identity",
    "storage",
    "tabs"
  ],
  "host_permissions": [
    "https://www.googleapis.com/",
    "https://accounts.google.com/"
  ],
  "optional_permissions": [
    "scripting"
  ],
  "optional_host_permissions": [
    "<all_urls>"
  ],
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+N"
      },
      "description": "Open Page Notes"
    },
    "open_all_notes": {
      "suggested_key": {
        "default": "Alt+O"
      },
      "description": "Open All Notes"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "pagenotes@manugarg.com"
    }
  }
}