Examine source code of Test-search-extension

{
  "background": {
    "scripts": []
  },
  "name": "Yahoo search (beta)",
  "short_name": "Yahoo search (beta)",
  "icons": {
    "128": "icons/icons-50.png"
  },
  "description": "Get access to yahoo search Results (test)",
  "version": "1.0.0.2",
  "manifest_version": 2,
  "browser_action": {
    "browser_style": true,
    "default_title": "Search override"
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "Yahoo search",
      "keyword": "Yahoo search",
      "favicon_url": "icons/icons-50.png",
      "search_url": "https://search.yahoo.com/yhs/search?p={searchTerms}",
      "suggest_url": "https://search.yahoo.com/sugg/ie?output=fxjson&command={searchTerms}&nResults=10",
      "is_default": true
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1303a911-4b3b-4de8-ba5b-dd8b09d59cef}"
    }
  }
}