Examine source code of Ebay Sort By ViewCount

{
  "manifest_version": 2,
  "name": "Ebay Sort By ViewCount",
  "version": "1.0",
  "description": "Lets you sort your eBay items by view count in the seller dashboard. At the moment, only works in Active listings. ",
  "icons": {
    "48": "viewCountLogo.png"
  },
  "content_scripts": [
    {
      "run_at": "document_end",
      "matches": [
        "*://*.ebay.com/*"
      ],
      "js": [
        "/sortByViewCount.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{79f9c358-7d09-4311-ba8f-27ec890d5feb}"
    }
  }
}