UPDATE 5.0 Part 1.5 COLOSSAL OUT NOW!
Make a bookmark (add site)
Change the site location to the code that you want
Press the bookmark when you want to use them
javascript:(function(){var js=document.body.appendChild(document.createElement("script"));js.onerror=function(){alert("Sorry, the script could not be loaded.")};js.src="https://rawgit.com/Krazete/bookmarklets/master/mouselight.js"})();