If you're a fan of the webcomic
xkcd -- if you're not, get over there now! and add
xkcd_rss to your friends list! -- then you probably realize that there's some extra funny hidden in the title (the text you see when you hover over an image) of the comic itself.
Firefox truncates this and trails off with periods of ellipsis, and I had my own clever workaround involving highlighting the image and right-clicking to View Selection Source so I could see the HTML markup for the image, and read the extra funny.
Well, I discovered the
Long Titles add-on for Firefox today. Install it, and mousing over an image will show you the entire title. Woot.
http://xkcd.com/552/