Examine source code of tabzaver

{
  "manifest_version": 2,
  "version": "0.0.1",
  "name": "tabzaver",
  "background": {
    "scripts": [
      "tabzaver.js"
    ]
  },
  "permissions": [
    "tabs",
    "clipboardWrite"
  ],
  "browser_action": {
    "default_icon": {
      "38": "icon38.png"
    },
    "default_title": "Copy tab URLs"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ce7d36fd-ce6f-4608-8619-a0ca533d87c7}"
    }
  }
}