Examine source code of VintedSnipe Connect

{
  "manifest_version": 2,
  "name": "__MSG_appName__",
  "description": "__MSG_appDesc__",
  "version": "0.1.4",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "default_locale": "en",
  "permissions": [
    "cookies",
    "tabs",
    "storage",
    "https://*.vinted.fr/*",
    "https://*.vinted.co.uk/*",
    "https://*.vinted.de/*",
    "https://*.vinted.es/*",
    "https://*.vinted.it/*",
    "https://*.vinted.nl/*",
    "https://*.vinted.be/*",
    "https://*.vinted.pl/*",
    "https://*.vinted.com/*",
    "https://*.vinted.lt/*",
    "https://*.vinted.pt/*",
    "https://*.vinted.cz/*",
    "https://*.vinted.sk/*",
    "https://*.vinted.at/*",
    "https://*.vinted.lu/*",
    "https://vintedsnipe.com/*",
    "https://*.vintedsnipe.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "connect@vintedsnipe.com",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo"
        ]
      }
    }
  },
  "browser_action": {
    "default_title": "VintedSnipe Connect",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.vintedsnipe.com/*",
        "https://vintedsnipe.com/*"
      ],
      "run_at": "document_start",
      "js": [
        "content-scripts/bridge.js"
      ]
    }
  ]
}