Examine source code of Rating Filter for Amazon

{
  "manifest_version": 3,
  "name": "Rating Filter for Amazon",
  "version": "1.0.0",
  "description": "Hide sponsored listings and products below your own star-rating and review-count thresholds. Not affiliated with Amazon.",
  "browser_specific_settings": {
    "gecko": {
      "id": "amazon-filter@x2com.nl",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "*://*.amazon.com/*",
    "*://*.amazon.co.uk/*",
    "*://*.amazon.de/*",
    "*://*.amazon.ca/*",
    "*://*.amazon.fr/*",
    "*://*.amazon.it/*",
    "*://*.amazon.es/*",
    "*://*.amazon.nl/*",
    "*://*.amazon.se/*",
    "*://*.amazon.pl/*",
    "*://*.amazon.com.be/*",
    "*://*.amazon.com.tr/*",
    "*://*.amazon.co.jp/*",
    "*://*.amazon.in/*",
    "*://*.amazon.com.au/*",
    "*://*.amazon.com.mx/*",
    "*://*.amazon.com.br/*",
    "*://*.amazon.sg/*",
    "*://*.amazon.ae/*",
    "*://*.amazon.sa/*",
    "*://*.amazon.eg/*",
    "*://*.amazon.cn/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.amazon.com/*",
        "*://*.amazon.co.uk/*",
        "*://*.amazon.de/*",
        "*://*.amazon.ca/*",
        "*://*.amazon.fr/*",
        "*://*.amazon.it/*",
        "*://*.amazon.es/*",
        "*://*.amazon.nl/*",
        "*://*.amazon.se/*",
        "*://*.amazon.pl/*",
        "*://*.amazon.com.be/*",
        "*://*.amazon.com.tr/*",
        "*://*.amazon.co.jp/*",
        "*://*.amazon.in/*",
        "*://*.amazon.com.au/*",
        "*://*.amazon.com.mx/*",
        "*://*.amazon.com.br/*",
        "*://*.amazon.sg/*",
        "*://*.amazon.ae/*",
        "*://*.amazon.sa/*",
        "*://*.amazon.eg/*",
        "*://*.amazon.cn/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "action": {
    "default_title": "Rating Filter for Amazon",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    }
  }
}