Examine source code of AmazonHelper

{
  "name": "AmazonHelper",
  "version": "1.0.6resigned1",
  "manifest_version": 2,
  "description": "extension for amazon listing",
  "content_scripts": [
    {
      "matches": [
        "*://catalog.amazon.com/abis/product/DisplayEditProduct*",
        "*://sellercentral.amazon.com/ap/signin?openid*"
      ],
      "js": [
        "jquery.js",
        "head.js"
      ]
    }
  ],
  "permissions": [
    "tabs",
    "bookmarks",
    "https://erp.nearbyexpress.com/api/product/listing/*",
    "https://sellercentral.amazon.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{46b71dd5-d4ca-4798-8d15-2f3325fe907e}"
    }
  }
}