Examine source code of CMScrape

{
  "description": "Add cardmarket links to a list to be exported",
  "manifest_version": 2,
  "name": "CMScrape - List",
  "version": "1.0",
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "48": "icons/logo_48.ico",
      "96": "icons/logo_96.ico"
    }
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.cardmarket.com/*"
      ],
      "js": [
        "js/addButton.js"
      ]
    }
  ]
}