Examine source code of Gibiru as search engine

{
  "manifest_version": 2,
  "name": "__MSG_name__",
  "short_name": "__MSG_short_name__",
  "version": "1.0.4",
  "default_locale": "en",
  "description": "__MSG_description__",
  "icons": {
    "16": "img/icon16.png",
    "48": "img/icon48.png",
    "128": "img/icon128.png"
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": "img/icon48.png",
    "default_title": "__MSG_name__",
    "default_popup": "html/gibiru.html"
  },
  "background": {
    "page": "html/gibiru.html"
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "gibiru.com",
      "keyword": "gibiru.com",
      "search_url": "https://www.gibiru.com/results.html?q={searchTerms}&client=__MSG_client__",
      "favicon_url": "https://www.gibiru.com/favicon.ico",
      "encoding": "UTF-8",
      "is_default": true
    }
  },
  "omnibox": {
    "keyword": "x"
  },
  "permissions": [
    "contextMenus",
    "activeTab",
    "https://*.gibiru.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.gibiru.com/*"
      ],
      "css": [
        "css/no-popin.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{45752dca-fe10-4cdb-a0a1-478be7f8f8fe}"
    }
  }
}