Chrome/Firefox/Internet Explorer: Facebook Chat now includes a feature that lets you know when a friend has read your message—or when you've read theirs. If you'd prefer to keep that information under wraps, Chat Undetected will do it for you.

With each update, Facebook has gotten incrementally more cluttered, perplexing, and ornery—and I'm not even talking about all your annoying acquaintances flooding it with inane status updates. Yet, at the same time, it's become a tool few of us can live without. If Facebook has you on your last nerve, here's how to fix some of its biggest annoyances in a matter of minutes—and with only one new addition to your browser.

Firefox/Chrome/Safari/Mailplane: Rapportive, a plugin which we've previously mentioned for its Gmail-enhancing powers, has recently added Twitter capabilities. So now you can follow, reply to, and retweet your contacts—all without leaving Gmail.