Creating a small tool window-like element with JavaScript.
If you add this to userscripts or similar, you can create a small window in the top right. By pressing buttons, you can execute defined functions and more.
var toolwindow = document.createElement("div");
toolwindow.id = "toolwindow";
toolwindow.innerHTML = [
'<button type="button" style="width: 100%;" name="myFunction" onclick="myFunction()">myFunction</button>',
'<div id="hidetoolwindow" onclick="hidetoolwindow()">hidetoolwindow</div>',
].join("");
document.body.appendChild(toolwindow);
var toolwindowStyle = document.createElement("style");
toolwindowStyle.type = "text/css";
toolwindowStyle.innerHTML = [
"#toolwindow {",
" position: fixed;",
" color: #f8f8f8;",
" z-index: 100000;",
" top: 10px;",
" right: 10px;",
" margin-left: auto;",
" margin-right: auto;",
" display: block;",
" background-color: black;",
" height: 100px;",
" width: 200px;",
" opacity: 0.7;",
" padding: 10px;",
"}",
"#toolwindow * {",
"font-size: 16px;",
"}",
"#hidetoolwindow {",
"padding-top: 60px;",
"}",
].join("");
document.body.appendChild(toolwindowStyle);
function myFunction(){alert('y')}