scriptrunner.js

var scripts = {
  "guesser": "https://gist.githubusercontent.com/djmill0326/3f09d644e0c30657100d1fdcf5e739be/raw/7e0ffdef8bb7087bc8ce194e37dc12cdcbc6842f/thing.js",
  "searchbuttons": "https://greasyfork.org/scripts/7543-google-search-extra-buttons/code/Google%20Search%20Extra%20Buttons.user.js",
  "translatetooltip": "https://openuserjs.org/install/trespassersW/translate.google_tooltip.min.user.js"
};

function fetchAndRunScript(url){
  fetch(url, {mode: 'cors'}).then(
    function(response){
      response.text().then(
        function(script){
          eval(script);
        }
      );
    }
  );
}

function runScript() {
  var scriptListString = "";

  for (var k in scripts) {
    if (scriptListString.length > 0) {
      scriptListString += ", ";
    }
    scriptListString += '"' + k + '"';
  }
  
  var script = prompt("What script do you want to run? Current options include: " + scriptListString);
  var scriptUrl = scripts[script.toLowerCase()];
  if(!scriptUrl) {
    alert("Script name is invalid. Try again.");
    runScript();
    return;
  }
  fetchAndRunScript(scriptUrl);
}

runScript();