Examine source code of Yeppon Club

{
  "name": "Yeppon Club",
  "description": "Un'estensione del Browser che ti avvisa quando navighi su un sito web con un cashback di Yeppon.it",
  "homepage_url": "https://www.yeppon.it",
  "author": "yeppon.it",
  "version": "1.0.12.0",
  "manifest_version": 3,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs",
    "webRequest",
    "storage",
    "cookies"
  ],
  "host_permissions": [
    "<all_urls>",
    "https://*.google.com/*",
    "https://*.google.it/*",
    "https://*.bing.com/*",
    "https://*.search.yahoo.com/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "/images/16x16.png",
      "32": "/images/32x32.png",
      "48": "/images/48x48.png",
      "128": "/images/128x128.png"
    }
  },
  "icons": {
    "16": "/images/16x16.png",
    "32": "/images/32x32.png",
    "48": "/images/48x48.png",
    "128": "/images/128x128.png"
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d669aa41-4aa9-4314-a435-a9151688dcfa}"
    }
  },
  "content_scripts": [
    {
      "js": [
        "checker_box.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "exclude_matches": [
        "https://*.google.com/*",
        "https://*.google.it/*",
        "https://*.bing.com/*",
        "https://*.search.yahoo.com/*",
        "https://*.bestshopping.com/*",
        "https://*.gov.it/*",
        "https://*.sieltecloud.it/*"
      ],
      "run_at": "document_idle",
      "css": [
        "styles_box.css"
      ]
    },
    {
      "js": [
        "translations.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start"
    },
    {
      "js": [
        "jump.js"
      ],
      "matches": [
        "https://it.bestshopping.com/*",
        "https://www.yeppon.it/cashback/jump/*"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://*.google.com/*",
        "https://*.google.it/*",
        "https://*.bing.com/*",
        "https://*.search.yahoo.com/*"
      ],
      "run_at": "document_end",
      "js": [
        "content.js"
      ],
      "css": [
        "content_bs.css"
      ]
    },
    {
      "matches": [
        "https://www.yeppon.it/*"
      ],
      "run_at": "document_end",
      "js": [
        "login.js"
      ]
    }
  ],
  "default_locale": "it"
}