Auto-sizing Menus extension

The Auto-sizing Menus extension does exactly what it says on the tin - it sizes the menus automatically, so that each is just wide enough for its longest link, without text-wrapping. You can also use it to make the first-level menus of a horizontal navbar match the width of their parent link.

Open a few menus to see it in action - each one is just the right size for its content, plus a little leeway space so the effect doesn't look too extreme.