Examine source code of Estatics

{
  "name": "Estatics",
  "version": "0.3.2",
  "description": "It is easier to reach all hidden information of a listing on Etsy such as views, favorites, tags, taxonomies...",
  "permissions": [
    "https://app.estatics.co/*",
    "https://api.sjpf.io/*",
    "https://api.fpjs.io/*",
    "*://localhost/*",
    "tabs",
    "activeTab",
    "storage"
  ],
  "manifest_version": 2,
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "content_scripts": [
    {
      "js": [
        "enhance-product-list.dist.js"
      ],
      "css": [
        "all.css"
      ],
      "matches": [
        "https://*.etsy.com/*"
      ]
    }
  ],
  "icons": {
    "32": "./images/logo_o_32.png",
    "64": "./images/logo_o_64.png",
    "128": "./images/logo_o_128.png"
  },
  "browser_action": {
    "default_icon": {
      "32": "./images/logo_o_32.png",
      "64": "./images/logo_o_64.png",
      "128": "./images/logo_o_128.png"
    },
    "default_title": "Estatics - Power your etsy selling",
    "default_popup": "options/options.html"
  },
  "web_accessible_resources": [
    "*.html",
    "popover/*",
    "*.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "son021293@gmail.com",
      "strict_min_version": "53.0"
    }
  }
}