Examine source code of Search ffmpeg filter

{
  "manifest_version": 2,
  "name": "Search ffmpeg filter",
  "version": "1.0",
  "description": "To use, type 'ff' plus your search term into the url bar.",
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "65.0a1",
      "id": "{b3e65079-c1bb-49d5-a5d6-e8b2ab115ca5}"
    }
  },
  "permissions": [],
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "ff",
      "search_url": "https://ffmpeg.org/ffmpeg-filters.html#{searchTerms}",
      "keyword": "ff",
      "favicon_url": "./icons/favicon.png",
      "is_default": false,
      "encoding": "UTF-8"
    }
  }
}