Examine source code of OneSearch pro

{
  "manifest_version": 2,
  "name": "OneSearch",
  "description": "__MSG_onesearch_extension_description__",
  "version": "1.0.16",
  "chrome_url_overrides": {
    "newtab": "ui/newtab.html"
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "OneSearch",
      "keyword": "OneSearch",
      "search_url": "https://onesearch.com/yhs/search?p={searchTerms}&yext=0",
      "suggest_url": "https://__MSG_onesearch_extension_search_suggest_domain__/?l=1&bm=3&output=fxjson&nresults=10&appid=www.onesearch.com&bck=false&spaceId=1351195845&command={searchTerms}",
      "favicon_url": "https://www.onesearch.com/favicon.ico",
      "encoding": "UTF-8",
      "is_default": true
    }
  },
  "default_locale": "en",
  "icons": {
    "128": "ui/img/Icon_128x128.png"
  },
  "browser_action": {
    "default_icon": {
      "128": "ui/img/Icon_128x128.png"
    }
  },
  "background": {
    "scripts": [
      "browser.js",
      "utils.js",
      "cryptoGet.js",
      "crypto.js",
      "HBEncoder.js",
      "HB.js",
      "I18N.js",
      "main.js"
    ]
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "https://*.onesearch.com/*",
    "history",
    "tabs",
    "idle"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{75a69d3e-2e0d-4cf8-9c55-a90a3bcf6c51}"
    }
  }
}