The Christmas Theme for Firefox brings some Holiday cheer to your browser. Start celebrating now with a Christmas theme or a Traditional Christmas theme. Whether you prefer snowmen and evergreens or the twinkling lights of your Christmas tree. To keep these free, we set your default search engine to ASK and Yahoo but you can easily switch back to your favorite, if needed. The Christmas Boom changes automatically with your computer's clock so your theme changes from day to night automatically. The Traditional Boom keeps its lights twinkling for you day or night.