Examine source code of Handy Screenshot

{
  "manifest_version": 3,
  "name": "Handy Screenshot",
  "description": "An easy tool for taking screenshots (full screen / visible part / selected by yourself)",
  "version": "1.5.1",
  "author": "ohhandy.com",
  "icons": {
    "256": "logo.png"
  },
  "action": {
    "default_icon": {
      "38": "logo.png"
    }
  },
  "background": {
    "scripts": [
      "bg.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "capture.html",
        "capture.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "extension_ids": []
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{72cf1cb4-6679-4939-bb21-d4ce36de507a}"
    }
  },
  "permissions": [
    "activeTab",
    "storage",
    "scripting",
    "notifications",
    "contextMenus",
    "clipboardWrite"
  ],
  "host_permissions": [
    "<all_urls>"
  ]
}