Examine source code of DropFromClipboard

{
  "name": "DropFromClipboard",
  "version": "1.20",
  "description": "Show image from clipboard to Drop into a webpage",
  "permissions": [
    "clipboardRead",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "dropfromclipboard@itszariep"
    }
  },
  "action": {
    "default_popup": "index.html"
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Shift+Alt+D"
      },
      "description": "Open DropFromClipboard"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "manifest_version": 3
}