The <select> element can now be customized with CSS

Some controls are better left unstyled. Look what happened to scrollbars: either they are too thin to grab, have bad color contrast, so it is hard to see what part to actually grab, and, finally, some smartypants have managed even to remove scrollbars altogether from their website. Sure, default select is not the prettiest control, but it gets it job done.

Unfortunately those unusably small or invisible scrollbars are the default in many browsers. Such as Firefox on Linux, which I'm using right now.