If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Be one of the bravest people in the city and join the firefighters! You will have to drive very fast across town, watching your time and making sure you do not crash. Use your nitro power to help you. When you reach a building on fire you will have to put it out before it takes over. Watch the bar in the bottom part of the screen and try to keep it from filling up, otherwise you could lose the game. There are eight great levels to enjoy. Have a blast!