Nothing is easier than opening up a favorite website or two and losing track of time. That's fine when you have time to spare, but it's a killer at work or when you have important things to do.
In situations where you can't afford distractions, Cold Turkey is your answer. You can choose common distracting sites to block, or add your own custom sites. It's also a great solution to keep your kids from visiting gaming sites when they should be doing homework.
Set how long you need to avoid distractions and then click the Go Cold Turkey! button. Until the timer is up, those sites will be completely inaccessible from any browser.