Firefox user styles aren't new by any means but if you haven't got around to using them because you're unfamiliar with them, this beginner's guide will help you get Firefox customised just the way you want it.
User styles are a great way to change Firefox and websites you visit look without having to recompile your browser or petition webmasters to institute your changes. Over at the how-to site How-To Geek they've put together a great beginner's guide to getting started with Stylish and installing user styles — browse the featured user styles here at Lifehacker to find some great ones.
Check out the full guide at the link below and get started customising your web browsing experience. Have a favourite user style? Share a link in the comments below.
Beginner Guide to User Styles for Firefox [How-To Geek]