Examine source code of R34 search engine

{
  "manifest_version": 2,
  "name": "R34 search engine",
  "version": "1.0",
  "description": "Adds the R34 search engine to Firefox.",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "R34",
      "keyword": "r34",
      "search_url": "https://rule34.xxx/index.php?page=post&s=list&tags={searchTerms}",
      "favicon_url": "https://rule34.xxx/favicon.ico"
    }
  },
  "author": "Roucool",
  "browser_specific_settings": {
    "gecko": {
      "id": "{5c9d3333-43c0-462f-8c60-4f839c0dc8e0}"
    }
  }
}