Examine source code of Ebay Copyhelper

{
  "manifest_version": 2,
  "name": "Ebay Copyhelper",
  "version": "1.1",
  "description": "Add copy Buttons for Order Num and User ID in Ebay",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "activeTab"
  ],
  "icons": {
    "96": "icon48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.ebay.com/vod/FetchOrderDetails*",
        "https://vod.ebay.com/vod/FetchOrderDetails*",
        "https://www.ebay.com/sh/ord*",
        "https://www.ebay.com/sh/ord/details*",
        "https://www.ebay.co.uk/vod/FetchOrderDetails*",
        "https://vod.ebay.co.uk/vod/FetchOrderDetails*",
        "https://www.ebay.co.uk/sh/ord*",
        "https://www.ebay.co.uk/sh/ord/details*",
        "https://www.ebay.de/vod/FetchOrderDetails*",
        "https://vod.ebay.de/vod/FetchOrderDetails*",
        "https://www.ebay.de/sh/ord*",
        "https://www.ebay.de/sh/ord/details*"
      ],
      "css": [
        "style.css"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "addoncopyhelper@ebay.com",
      "strict_min_version": "48.0"
    }
  }
}