Examine source code of Append to Clipboard

{
  "manifest_version": 3,
  "name": "__MSG_extensionName__",
  "short_name": "__MSG_extensionShortName__",
  "description": "__MSG_extensionDescription__",
  "author": "Brett Zamir",
  "version": "3.1.2",
  "homepage_url": "https://github.com/brettz9/append-to-clipboard/",
  "permissions": [
    "contextMenus",
    "storage",
    "clipboardWrite",
    "clipboardRead",
    "activeTab",
    "scripting"
  ],
  "background": {
    "type": "module",
    "scripts": [
      "lib/background.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": false
  },
  "icons": {
    "128": "icon.png"
  },
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "jid0-o20OcJEteABtgjFUKPfXyQhRIQg@jetpack"
    }
  }
}