Examine source code of Zillow Data Exporter

{
  "name": "Zillow Data Exporter",
  "description": "Export Zillow property listings to CSV or Excel in one click.",
  "manifest_version": 2,
  "version": "1.9.1",
  "icons": {
    "16": "16x16.png",
    "48": "48x48.png",
    "128": "128x128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "16x16.png",
      "48": "48x48.png",
      "128": "128x128.png"
    },
    "default_title": "Zillow Data Exporter"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.zillow.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    },
    {
      "matches": [
        "https://*.zillowdataexporter.com/*"
      ],
      "js": [
        "zillowdataexporter.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    },
    {
      "matches": [
        "https://*.propertydatalabs.com/*"
      ],
      "js": [
        "zillowdataexporter.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    "16x16.png",
    "48x48.png",
    "128x128.png",
    "menu.html",
    "toolbar.html",
    "sticky.html",
    "assistant.html"
  ],
  "permissions": [
    "https://*.zillow.com/*",
    "https://*.zillowdataexporter.com/*",
    "https://*.propertydatalabs.com/*",
    "storage",
    "tabs",
    "downloads"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d50800a7-a427-422c-8711-aee04fa42f0a}"
    }
  }
}