Friday the 13th could be your lucky day if you enter the Joy of Tech’s giveaway. Nitrozac and Snaggy are giving away three copies of the new Firefox and Thunderbird Garage book. To enter, all you have to do is post a reply to a forum thread, but don’t delay, as the giveaway ends tomorrow at noon Pacific time. The Joy of Tech comic series routinely delivers a humorous look at technology and the issues surrounding it.