Examine source code of Copy UUID

{
  "name": "Copy UUID",
  "version": "1.3resigned1",
  "description": "An extension for copying a uuid to the clipboard",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icons/copy-48.png",
    "96": "icons/copy-96.png"
  },
  "permissions": [
    "contextMenus",
    "clipboardWrite",
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://frontend.xq/*",
        "*://*.cyberscore.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{eaff4605-47a2-44f0-9897-da7d0192abd3}"
    }
  }
}