Startpage (EU) search engine

Add Startpage (EU) [eu.startpage.com] search engine to Firefox
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manifest.json
{
  "name": "Startpage (EU) search engine",
  "short_name": "Startpage EU",
  "manifest_version": 2,
  "description": "Add-on adding Startpage (EU) [eu.startpage.com] search engine to Firefox",
  "version": "1.0",
  "icons": {
    "16": "icons/startpage_icon.svg",
    "48": "icons/startpage_icon.svg",
    "96": "icons/startpage_icon.svg",
    "128": "icons/startpage_icon.svg",
    "256": "icons/startpage_icon.svg",
    "512": "icons/startpage_icon.svg"
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "Startpage",
      "keyword": "sp",
      "is_default": true,
      "favicon_url": "https://eu.startpage.com/favicon.ico",
      "search_url": "https://eu.startpage.com/do/dsearch",
      "search_url_get_params": "query={searchTerms}",
      "suggest_url": "https://eu.startpage.com/do/suggest",
      "suggest_url_get_params": "limit=10&lang=english&format=json&query={searchTerms}"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{202f5804-4013-40af-ac21-220f77777f2a}"
    }
  }
}