Examine source code of Copy Rupee

{
  "manifest_version": 2,
  "name": "Copy Rupee",
  "description": "Copy the rupee sign (₹) on clipboard",
  "version": "1.0",
  "browser_action": {
    "default_icon": "icon.png"
  },
  "background": {
    "scripts": [
      "popup.js"
    ],
    "persistent": false
  },
  "permissions": [
    "clipboardWrite"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{13e92169-1b9e-4043-85e1-4248982fb561}"
    }
  }
}