Address bar search engine switcher

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "__MSG_extname__",
  "description": "__MSG_extdesc__",
  "default_locale": "en",
  "permissions": [
    "storage",
    "unlimitedStorage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "icons": {
    "96": "icons/128.png"
  },
  "browser_action": {
    "default_icon": {
      "32": "icons/32.png",
      "48": "icons/48.png",
      "96": "icons/96.png",
      "128": "icons/128.png"
    },
    "default_popup": "pages/popup/popup.html"
  },
  "background": {
    "page": "pages/background/bg.html"
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "__MSG_address_bar_search_name__",
      "keyword": "search",
      "favicon_url": "https://i.extfans.com/focus/favicon.ico",
      "search_url": "https://search.extfans.com/query/?q={searchTerms}",
      "encoding": "UTF-8",
      "is_default": true
    }
  },
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "version": "1.0.6"
}