chrome post url DDG

manifest.json

{
    "manifest_version": 2,
    "version": "1.0",
    "name": "my search plugin",
    "chrome_settings_overrides": {
        "search_provider": {
            "name": "My duckduckgo",
            "search_url": "https://duckduckgo.com/?kae=d&kp=-1&kn=1&kg=p&kl=wt-wt&kad=en_US&k1=-1&kaj=u&kal=-1&kak=-1&kz=-1",
            "search_url_post_params": "kd=-1&k1=-1&kg=p&kl=-1&kp=-1&kn=1&q={searchTerms}",
            "is_default": false
        }
    }
}