Examine source code of Yahoo Springboard

{
  "manifest_version": 3,
  "version": "1.1.0",
  "name": "Yahoo Springboard",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "action": {
    "default_icon": "icons/Y_NT64.png"
  },
  "permissions": [
    "tabs",
    "unlimitedStorage",
    "storage",
    "alarms",
    "notifications",
    "declarativeNetRequestWithHostAccess"
  ],
  "background": {
    "scripts": [
      "service-worker.js"
    ]
  },
  "host_permissions": [
    "*://*.yahoo.com/",
    "https://s.yimg.com/",
    "https://sxh.yimg.com/"
  ],
  "description": "This new tab and experience offers a starting point for your online session.",
  "icons": {
    "128": "icons/Y_NT64.png"
  },
  "chrome_settings_overrides": {
    "homepage": "https://search.yahoo.com/yhs/?extInst=1&hspart=ytest&hsimp=yhs-ff1",
    "search_provider": {
      "name": "Yahoo",
      "search_url": "https://search.yahoo.com/yhs/search?p={searchTerms}&hspart=ytest&hsimp=yhs-ff1&manifest=1",
      "suggest_url": "https://search.yahoo.com/sugg/ie?output=fxjson&command={searchTerms}&nResults=10",
      "is_default": true,
      "keyword": "Yahoo",
      "encoding": "UTF-8"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a99285a5-b1ae-4ed7-8d10-8380ab73ddc3}"
    }
  }
}