Adds !s to StartPage, like DDG

StartPage Bangs

// ==UserScript==
// @name			StartPage Bangs
// @namespace 			http://tarkus.co/
// @version			0.1
// @description			Adds !s to StartPage, like DDG
// @match			https://startpage.com/*
// @run-at 			document-start
// ==/UserScript==

// Bangs
function starts_with(haystack, needle) {
	return (haystack.substr(0, needle.length) == needle);
}

function get_dict() {
	var out = {};
	var params = document.location.search.substr(1).split("&");
	var param = [];
	for(var i = 0; i < params.length; i++) {
		param = params[i].split("=");
		out[param[0]] = param[1];
	}
	return out;
}

function bang(query) {
	if(starts_with(query, "!")) {
		var bangs = {
			"!g": "https://www.google.com/#q=",
			"!gi": "https://encrypted.google.com/search?tbm=isch&q=",
			"!gis": "https://www.google.com/searchbyimage?image_url=",
			"!so": "https://stackoverflow.com/search?q=",
			"!ddg": "https://duckduckgo.com/?q=",
		};
		
		var query_split = query.split(" ");
		
		if(bangs[query_split[0]] !== undefined) {
			window.location.replace(bangs[query_split[0]] + query.substr(query_split[0].length + 1, query.length));
		}
	}
}

var query = get_dict()["query"];

// For POST only, requires whole page to load
if(query === undefined) {
	window.onload = function () {
		bang(document.getElementById("query_top").value);
	};
} else {
	bang(query.replace("%21", "!").replace("+", " "));
}

Here, 2023
On my Firefox, it's not working.
Have you try for now ?
Thanks
Amazing work