Examine source code of SearchCleaner

{
  "manifest_version": 3,
  "name": "SearchCleaner",
  "version": "1.2.5",
  "description": "Automatically append preset text to search engine queries to exclude unwanted domains.",
  "browser_specific_settings": {
    "gecko": {
      "id": "searchcleaner@searchcleaner.local",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "config/searchEngines.json"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "host_permissions": [
    "https://*.amazon.co.uk/*",
    "https://*.amazon.de/*",
    "https://*.amazon.fr/*",
    "https://*.amazon.jp/*",
    "https://*.google.co.uk/*",
    "https://*.google.de/*",
    "https://*.google.fr/*",
    "https://*.google.jp/*",
    "https://*.search.yahoo.com/*",
    "https://*.wikipedia.org/*",
    "https://amazon.com/*",
    "https://andisearch.com/*",
    "https://aol.com/*",
    "https://ask.com/*",
    "https://baidu.com/*",
    "https://bing.com/*",
    "https://dogpile.com/*",
    "https://duckduckgo.com/*",
    "https://ecosia.org/*",
    "https://gigablast.com/*",
    "https://givero.com/*",
    "https://google.com/*",
    "https://iask.ai/*",
    "https://komo.ai/*",
    "https://metacrawler.com/*",
    "https://metager.org/*",
    "https://mojeek.com/*",
    "https://oceanhero.today/*",
    "https://perplexity.ai/*",
    "https://phind.com/*",
    "https://qwant.com/*",
    "https://search.aol.com/*",
    "https://search.brave.com/*",
    "https://search.bus-hit.me/*",
    "https://search.com/*",
    "https://search.daum.net/*",
    "https://search.naver.com/*",
    "https://search.seznam.cz/*",
    "https://search.yahoo.com/*",
    "https://searx.be/*",
    "https://searx.work/*",
    "https://sogou.com/*",
    "https://startpage.com/*",
    "https://swisscows.com/*",
    "https://tiktok.com/*",
    "https://wikipedia.org/*",
    "https://www.amazon.com/*",
    "https://www.andisearch.com/*",
    "https://www.ask.com/*",
    "https://www.baidu.com/*",
    "https://www.bing.com/*",
    "https://www.daum.net/*",
    "https://www.dogpile.com/*",
    "https://www.duckduckgo.com/*",
    "https://www.ecosia.org/*",
    "https://www.gigablast.com/*",
    "https://www.givero.com/*",
    "https://www.google.com/*",
    "https://www.iask.ai/*",
    "https://www.komo.ai/*",
    "https://www.metacrawler.com/*",
    "https://www.metager.org/*",
    "https://www.mojeek.com/*",
    "https://www.oceanhero.today/*",
    "https://www.perplexity.ai/*",
    "https://www.phind.com/*",
    "https://www.qwant.com/*",
    "https://www.search.com/*",
    "https://www.search.naver.com/*",
    "https://www.seznam.cz/*",
    "https://www.sogou.com/*",
    "https://www.startpage.com/*",
    "https://www.swisscows.com/*",
    "https://www.tiktok.com/*",
    "https://www.wikipedia.org/*",
    "https://www.yandex.com/*",
    "https://www.yandex.ru/*",
    "https://www.you.com/*",
    "https://www.youtube.com/*",
    "https://yandex.com/*",
    "https://yandex.ru/*",
    "https://you.com/*",
    "https://youtube.com/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "storage/storage.js",
      "background/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.amazon.co.uk/*",
        "https://*.amazon.de/*",
        "https://*.amazon.fr/*",
        "https://*.amazon.jp/*",
        "https://*.google.co.uk/*",
        "https://*.google.de/*",
        "https://*.google.fr/*",
        "https://*.google.jp/*",
        "https://*.search.yahoo.com/*",
        "https://*.wikipedia.org/*",
        "https://amazon.com/*",
        "https://andisearch.com/*",
        "https://aol.com/*",
        "https://ask.com/*",
        "https://baidu.com/*",
        "https://bing.com/*",
        "https://dogpile.com/*",
        "https://duckduckgo.com/*",
        "https://ecosia.org/*",
        "https://gigablast.com/*",
        "https://givero.com/*",
        "https://google.com/*",
        "https://iask.ai/*",
        "https://komo.ai/*",
        "https://metacrawler.com/*",
        "https://metager.org/*",
        "https://mojeek.com/*",
        "https://oceanhero.today/*",
        "https://perplexity.ai/*",
        "https://phind.com/*",
        "https://qwant.com/*",
        "https://search.aol.com/*",
        "https://search.brave.com/*",
        "https://search.bus-hit.me/*",
        "https://search.com/*",
        "https://search.daum.net/*",
        "https://search.naver.com/*",
        "https://search.seznam.cz/*",
        "https://search.yahoo.com/*",
        "https://searx.be/*",
        "https://searx.work/*",
        "https://sogou.com/*",
        "https://startpage.com/*",
        "https://swisscows.com/*",
        "https://tiktok.com/*",
        "https://wikipedia.org/*",
        "https://www.amazon.com/*",
        "https://www.andisearch.com/*",
        "https://www.ask.com/*",
        "https://www.baidu.com/*",
        "https://www.bing.com/*",
        "https://www.daum.net/*",
        "https://www.dogpile.com/*",
        "https://www.duckduckgo.com/*",
        "https://www.ecosia.org/*",
        "https://www.gigablast.com/*",
        "https://www.givero.com/*",
        "https://www.google.com/*",
        "https://www.iask.ai/*",
        "https://www.komo.ai/*",
        "https://www.metacrawler.com/*",
        "https://www.metager.org/*",
        "https://www.mojeek.com/*",
        "https://www.oceanhero.today/*",
        "https://www.perplexity.ai/*",
        "https://www.phind.com/*",
        "https://www.qwant.com/*",
        "https://www.search.com/*",
        "https://www.search.naver.com/*",
        "https://www.seznam.cz/*",
        "https://www.sogou.com/*",
        "https://www.startpage.com/*",
        "https://www.swisscows.com/*",
        "https://www.tiktok.com/*",
        "https://www.wikipedia.org/*",
        "https://www.yandex.com/*",
        "https://www.yandex.ru/*",
        "https://www.you.com/*",
        "https://www.youtube.com/*",
        "https://yandex.com/*",
        "https://yandex.ru/*",
        "https://you.com/*",
        "https://youtube.com/*",
        "https://*/*"
      ],
      "js": [
        "content/shared.js",
        "content/redirect.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://*.amazon.co.uk/*",
        "https://*.amazon.de/*",
        "https://*.amazon.fr/*",
        "https://*.amazon.jp/*",
        "https://*.google.co.uk/*",
        "https://*.google.de/*",
        "https://*.google.fr/*",
        "https://*.google.jp/*",
        "https://*.search.yahoo.com/*",
        "https://*.wikipedia.org/*",
        "https://amazon.com/*",
        "https://andisearch.com/*",
        "https://aol.com/*",
        "https://ask.com/*",
        "https://baidu.com/*",
        "https://bing.com/*",
        "https://dogpile.com/*",
        "https://duckduckgo.com/*",
        "https://ecosia.org/*",
        "https://gigablast.com/*",
        "https://givero.com/*",
        "https://google.com/*",
        "https://iask.ai/*",
        "https://komo.ai/*",
        "https://metacrawler.com/*",
        "https://metager.org/*",
        "https://mojeek.com/*",
        "https://oceanhero.today/*",
        "https://perplexity.ai/*",
        "https://phind.com/*",
        "https://qwant.com/*",
        "https://search.aol.com/*",
        "https://search.brave.com/*",
        "https://search.bus-hit.me/*",
        "https://search.com/*",
        "https://search.daum.net/*",
        "https://search.naver.com/*",
        "https://search.seznam.cz/*",
        "https://search.yahoo.com/*",
        "https://searx.be/*",
        "https://searx.work/*",
        "https://sogou.com/*",
        "https://startpage.com/*",
        "https://swisscows.com/*",
        "https://tiktok.com/*",
        "https://wikipedia.org/*",
        "https://www.amazon.com/*",
        "https://www.andisearch.com/*",
        "https://www.ask.com/*",
        "https://www.baidu.com/*",
        "https://www.bing.com/*",
        "https://www.daum.net/*",
        "https://www.dogpile.com/*",
        "https://www.duckduckgo.com/*",
        "https://www.ecosia.org/*",
        "https://www.gigablast.com/*",
        "https://www.givero.com/*",
        "https://www.google.com/*",
        "https://www.iask.ai/*",
        "https://www.komo.ai/*",
        "https://www.metacrawler.com/*",
        "https://www.metager.org/*",
        "https://www.mojeek.com/*",
        "https://www.oceanhero.today/*",
        "https://www.perplexity.ai/*",
        "https://www.phind.com/*",
        "https://www.qwant.com/*",
        "https://www.search.com/*",
        "https://www.search.naver.com/*",
        "https://www.seznam.cz/*",
        "https://www.sogou.com/*",
        "https://www.startpage.com/*",
        "https://www.swisscows.com/*",
        "https://www.tiktok.com/*",
        "https://www.wikipedia.org/*",
        "https://www.yandex.com/*",
        "https://www.yandex.ru/*",
        "https://www.you.com/*",
        "https://www.youtube.com/*",
        "https://yandex.com/*",
        "https://yandex.ru/*",
        "https://you.com/*",
        "https://youtube.com/*",
        "https://*/*"
      ],
      "js": [
        "content/shared.js",
        "content/indicator.js"
      ],
      "run_at": "document_end"
    }
  ],
  "action": {
    "default_popup": "popup/popup.html",
    "default_title": "SearchCleaner",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon48.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}