Examine source code of Keep your clipboard

{
  "manifest_version": 2,
  "name": "Clipboard Manager",
  "version": "1.0",
  "description": "Keeps a history of copied text and allows you to reuse or manage them easily.",
  "permissions": [
    "clipboardRead",
    "clipboardWrite",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8c76598c-640c-4f5c-8e1d-98abc72c0462}"
    }
  }
}