Examine source code of Search Start

{
  "manifest_version": 2,
  "name": "Search Start",
  "description": "Make Yahoo your default search engine with SearchStart.co and enjoy hassle-free browsing with every search.",
  "version": "1.0.0",
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "SearchStart",
      "keyword": "SearchStart",
      "favicon_url": "https://searchstart.co/favicon.png",
      "search_url": "https://search.yahoo.com/search?q={searchTerms}",
      "suggest_url": "https://search.yahoo.com/sugg/ie?output=fxjson&command={searchTerms}&nResults=10",
      "encoding": "UTF-8",
      "is_default": true
    }
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "128": "images/icon128.png"
    },
    "default_title": "SearchStart"
  },
  "icons": {
    "128": "images/icon128.png"
  },
  "permissions": [
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "backgroundWorker/background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8937fd77-733f-4f23-9c34-436ca018ec27}"
    }
  }
}