Examine source code of Clipboard saver

{
  "manifest_version": 2,
  "name": "Clipboard Manager",
  "version": "1.0",
  "description": "Save and manage clipboard history directly in your browser.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Clipboard Manager"
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2c4f7a1d-e328-49c5-85b3-6d0547317c4e}"
    }
  }
}