Kylo is a free browser you use from your couch that embraces the 10-foot UI philosophy. The idea is that buttons, menus and text are larger than when viewed at your desk. This aids in usability when sitting farther away from the display, as would be the case in a living room environment.
It is powered by Mozilla -- which may or may not be a feature depending on your opinion -- and is easy to navigate with little visual clutter. In addition to standard Web browsing, Kylo offers a host of online video options, including YouTube, Netflix and many network offerings. The most notable source that appears to be absent is Hulu; if you browse the Kylo forums you'll find there are workarounds to this, but your mileage may vary.
The experience is definitely more pleasurable than using Firefox in full-screen mode. The only issue I really have with Kylo is that, even though it is free, there is an occasional advertisement for its companion product, the Loop. The ads don't seem to be too intrusive, but that could change in the future.
If you've got a Mac that you hook up to your TV for online video duty or just general Web surfing from the couch, then Kylo seems to be a real winner. Do you have any other suggestions for couch computing? We'd love to hear from you in the comments about how you're getting the most out of the 10-foot experience with your Mac.